This repository is a collection of various materials and tools that I use every day in my work. It contains a lot of useful information gathered in one piece. It is an invaluable source of knowledge for me that I often look back on.
For everyone, really. Here everyone can find their favourite tastes. But to be perfectly honest, it is aimed towards System and Network administrators, DevOps, Pentesters, and Security Researchers.
If you find something which doesn't make sense, or something doesn't seem right, please make a pull request and please add valid and well-reasoned explanations about your changes or comments.
If this project is useful and important for you or if you really like _the-book-of-secret-knowledge_, you can bring **positive energy** by giving some **good words** or **supporting this project**. Thank you!
:small_orange_diamond: <ahref="https://www.gnu.org/software/bash/"><b>GNU Bash</b></a> - is an sh-compatible shell that incorporates useful features from the Korn shell and C shell.<br>
:small_orange_diamond: <ahref="https://www.zsh.org/"><b>Zsh</b></a> - is a shell designed for interactive use, although it is also a powerful scripting language.<br>
:small_orange_diamond: <ahref="https://tcl-lang.org/"><b>tclsh</b></a> - is a very powerful cross-platform shell, suitable for a huge range of uses.<br>
:small_orange_diamond: <ahref="https://github.com/Bash-it/bash-it"><b>bash-it</b></a> - is a framework for using, developing and maintaining shell scripts and custom commands.<br>
:small_orange_diamond: <ahref="https://midnight-commander.org/"><b>Midnight Commander</b></a> - is a visual file manager, licensed under GNU General Public License.<br>
:small_orange_diamond: <ahref="https://github.com/ranger/ranger"><b>ranger</b></a> - is a VIM-inspired filemanager for the console.<br>
:small_orange_diamond: <ahref="https://github.com/jarun/nnn"><b>nnn</b></a> - is a tiny, lightning fast, feature-packed file manager.<br>
:small_orange_diamond: <ahref="https://www.gnu.org/software/screen/"><b>screen</b></a> - is a full-screen window manager that multiplexes a physical terminal.<br>
:small_orange_diamond: <ahref="https://github.com/tmux/tmux/wiki"><b>tmux</b></a> - is a terminal multiplexer, lets you switch easily between several programs in one terminal.<br>
:small_orange_diamond: <ahref="https://github.com/peikk0/tmux-cssh"><b>tmux-cssh</b></a> - is a tool to set comfortable and easy to use functionality, clustering and synchronizing tmux-sessions.<br>
:small_orange_diamond: <ahref="https://www.gnu.org/software/emacs/"><b>emacs</b></a> - is an extensible, customizable, free/libre text editor - and more.<br>
:small_orange_diamond: <ahref="https://github.com/zyedidia/micro"><b>micro</b></a> - is a modern and intuitive terminal-based text editor.<br>
:small_orange_diamond: <ahref="https://neovim.io/"><b>neovim</b></a> - is a free open source, powerful, extensible and usable code editor.<br>
:small_orange_diamond: <ahref="https://www.putty.org/"><b>PuTTY</b></a> - is an SSH and telnet client, developed originally by Simon Tatham.<br>
:small_orange_diamond: <ahref="https://nmap.org/"><b>nmap</b></a> - is a free and open source (license) utility for network discovery and security auditing.<br>
:small_orange_diamond: <ahref="https://github.com/robertdavidgraham/masscan"><b>masscan</b></a> - is the fastest Internet port scanner, spews SYN packets asynchronously.<br>
:small_orange_diamond: <ahref="https://github.com/gvb84/pbscan"><b>pbscan</b></a> - is a faster and more efficient stateless SYN scanner and banner grabber.<br>
:small_orange_diamond: <ahref="http://www.hping.org/"><b>hping</b></a> - is a command-line oriented TCP/IP packet assembler/analyzer.<br>
:small_orange_diamond: <ahref="https://github.com/traviscross/mtr"><b>mtr</b></a> - is a tool that combines the functionality of the 'traceroute' and 'ping' programs in a single network diagnostic tool.<br>
:small_orange_diamond: <ahref="https://github.com/mehrdadrad/mylg"><b>mylg</b></a> - is an open source utility which combines the functions of the different network probes in one diagnostic tool.<br>
:small_orange_diamond: <ahref="http://netcat.sourceforge.net/"><b>netcat</b></a> - is a networking utility which reads and writes data across network connections, using the TCP/IP protocol.<br>
:small_orange_diamond: <ahref="https://www.tcpdump.org/"><b>tcpdump</b></a> - is a powerful command-line packet analyzer.<br>
:small_orange_diamond: <ahref="https://www.wireshark.org/docs/man-pages/tshark.html"><b>tshark</b></a> - is a tool that allows us to dump and analyze network traffic (wireshark cli).<br>
:small_orange_diamond: <ahref="https://github.com/google/stenographer"><b>stenographer</b></a> - is a packet capture solution which aims to quickly spool all packets to disk.<br>
:small_orange_diamond: <ahref="https://github.com/tgraf/bmon"><b>bmon</b></a> - is a monitoring and debugging tool to capture networking related statistics and prepare them visually.<br>
:small_orange_diamond: <ahref="http://iptraf.seul.org/2.6/manual.html#installation"><b>iptraf-ng</b></a> - is a console-based network monitoring program for Linux that displays information about IP traffic.<br>
:small_orange_diamond: <ahref="https://iperf.fr/"><b>iPerf3</b></a> - is a tool for active measurements of the maximum achievable bandwidth on IP networks.<br>
:small_orange_diamond: <ahref="https://github.com/Microsoft/Ethr"><b>ethr</b></a> - is a Network Performance Measurement Tool for TCP, UDP & HTTP.<br>
:small_orange_diamond: <ahref="https://github.com/jwbensley/Etherate"><b>Etherate</b></a> - is a Linux CLI based Ethernet and MPLS traffic testing tool.<br>
:small_orange_diamond: <ahref="https://github.com/troglobit/nemesis"><b>Nemesis</b></a> - packet manipulation CLI tool; craft and inject packets of several protocols.<br>
:small_orange_diamond: <ahref="https://github.com/packetfu/packetfu"><b>packetfu</b></a> - a mid-level packet manipulation library for Ruby.<br>
:small_orange_diamond: <ahref="https://scapy.net/"><b>Scapy</b></a> - packet manipulation library; forge, send, decode, capture packets of a wide number of protocols.<br>
:small_orange_diamond: <ahref="https://github.com/SecureAuthCorp/impacket"><b>impacket</b></a> - is a collection of Python classes for working with network protocols.<br>
:small_orange_diamond: <ahref="https://github.com/x-way/iptables-tracer"><b>iptables-tracer</b></a> - observe the path of packets through the iptables chains.<br>
:small_orange_diamond: <ahref="https://github.com/mschwager/fierce"><b>fierce</b></a> - is a DNS reconnaissance tool for locating non-contiguous IP space.<br>
:small_orange_diamond: <ahref="https://github.com/subfinder/subfinder"><b>subfinder</b></a> - is a subdomain discovery tool that discovers valid subdomains for websites.<br>
:small_orange_diamond: <ahref="https://github.com/aboul3la/Sublist3r"><b>sublist3r</b></a> - is a fast subdomains enumeration tool for penetration testers.<br>
:small_orange_diamond: <ahref="https://github.com/OWASP/Amass"><b>amass</b></a> - is tool that obtains subdomain names by scraping data sources, crawling web archives and more.<br>
:small_orange_diamond: <ahref="https://github.com/google/namebench"><b>namebench</b></a> - provides personalized DNS server recommendations based on your browsing history.<br>
:small_orange_diamond: <ahref="https://github.com/guelfoweb/knock"><b>knock</b></a> - is a tool to enumerate subdomains on a target domain through a wordlist.<br>
:small_orange_diamond: <ahref="https://github.com/jedisct1/dnscrypt-proxy"><b>dnscrypt-proxy 2</b></a> - a flexible DNS proxy, with support for encrypted DNS protocols.<br>
:small_orange_diamond: <ahref="https://github.com/dnsdb/dnsdbq"><b>dnsdbq</b></a> - API client providing access to passive DNS database systems (pDNS at Farsight Security, CIRCL pDNS).<br>
:small_orange_diamond: <ahref="https://github.com/looterz/grimd"><b>grimd</b></a> - fast dns proxy, built to black-hole internet advertisements and malware servers.<br>
:small_orange_diamond: <ahref="https://curl.haxx.se/"><b>Curl</b></a> - is a command line tool and library for transferring data with URLs.<br>
:small_orange_diamond: <ahref="https://gitlab.com/davidjpeacock/kurly"><b>kurly</b></a> - is an alternative to the widely popular curl program, written in Golang.<br>
:small_orange_diamond: <ahref="https://github.com/asciimoo/wuzz"><b>wuzz</b></a> - is an interactive cli tool for HTTP inspection.<br>
:small_orange_diamond: <ahref="https://github.com/trimstray/htrace.sh"><b>htrace.sh</b></a> - is a simple Swiss Army knife for http/https troubleshooting and profiling.<br>
:small_orange_diamond: <ahref="https://github.com/reorx/httpstat"><b>httpstat</b></a> - is a tool that visualizes curl statistics in a way of beauty and clarity.<br>
:small_orange_diamond: <ahref="https://github.com/gchaincl/httplab"><b>httplab</b></a> - is an interactive web server.<br>
:small_orange_diamond: <ahref="https://github.com/dhamaniasad/HeadlessBrowsers"><b>HeadlessBrowsers</b></a> - a list of (almost) all headless web browsers in existence.<br>
:small_orange_diamond: <ahref="https://httpd.apache.org/docs/2.4/programs/ab.html"><b>ab</b></a> - is a single-threaded command line tool for measuring the performance of HTTP web servers.<br>
:small_orange_diamond: <ahref="https://www.joedog.org/siege-home/"><b>siege</b></a> - is an http load testing and benchmarking utility.<br>
:small_orange_diamond: <ahref="https://github.com/wg/wrk"><b>wrk</b></a> - is a modern HTTP benchmarking tool capable of generating significant load.<br>
:small_orange_diamond: <ahref="https://github.com/giltene/wrk2"><b>wrk2</b></a> - is a constant throughput, correct latency recording variant of wrk.<br>
:small_orange_diamond: <ahref="https://github.com/codesenberg/bombardier"><b>bombardier</b></a> - is a fast cross-platform HTTP benchmarking tool written in Go.<br>
:small_orange_diamond: <ahref="https://github.com/tarekziade/boom"><b>boom</b></a> - is a script you can use to quickly smoke-test your web app deployment.<br>
:small_orange_diamond: <ahref="https://github.com/shekyan/slowhttptest"><b>SlowHTTPTest</b></a> - is a tool that simulates some Application Layer Denial of Service attacks by prolonging HTTP.<br>
:small_orange_diamond: <ahref="https://github.com/OJ/gobuster"><b>gobuster</b></a> - is a free and open source directory/file & DNS busting tool written in Go.<br>
:small_orange_diamond: <ahref="https://www.openssl.org/"><b>openssl</b></a> - is a robust, commercial-grade, and full-featured toolkit for the TLS and SSL protocols.<br>
:small_orange_diamond: <ahref="https://gnutls.org/manual/html_node/gnutls_002dcli-Invocation.html"><b>gnutls-cli</b></a> - client program to set up a TLS connection to some other computer.<br>
:small_orange_diamond: <ahref="https://github.com/drwetter/testssl.sh"><b>testssl.sh</b></a> - testing TLS/SSL encryption anywhere on any port.<br>
:small_orange_diamond: <ahref="https://github.com/mozilla/cipherscan"><b>cipherscan</b></a> - a very simple way to find out which SSL ciphersuites are supported by a target.<br>
:small_orange_diamond: <ahref="http://www.tarsnap.com/spiped.html"><b>spiped</b></a> - is a utility for creating symmetrically encrypted and authenticated pipes between socket addresses.<br>
:small_orange_diamond: <ahref="https://github.com/certbot/certbot"><b>Certbot</b></a> - is EFF's tool to obtain certs from Let's Encrypt and (optionally) auto-enable HTTPS on your server.<br>
:small_orange_diamond: <ahref="https://github.com/FiloSottile/mkcert"><b>mkcert</b></a> - simple zero-config tool to make locally trusted development certificates with any names you'd like.<br>
:small_orange_diamond: <ahref="https://github.com/yassineaboukir/sublert"><b>Sublert</b></a> - is a security and reconnaissance tool to automatically monitor new subdomains.<br>
:small_orange_diamond: <ahref="https://github.com/trimstray/mkchain"><b>mkchain</b></a> - open source tool to help you build a valid SSL certificate chain.<br>
:small_orange_diamond: <ahref="https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/5/html/deployment_guide/ch-selinux"><b>SELinux</b></a> - provides a flexible Mandatory Access Control (MAC) system built into the Linux kernel.<br>
:small_orange_diamond: <ahref="https://wiki.ubuntu.com/AppArmor"><b>AppArmor</b></a> - proactively protects the operating system and applications from external or internal threats.<br>
:small_orange_diamond: <ahref="https://www.ossec.net/"><b>ossec</b></a> - actively monitoring all aspects of system activity with file integrity monitoring.<br>
:small_orange_diamond: <ahref="https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/security_guide/chap-system_auditing"><b>auditd</b></a> - provides a way to track security-relevant information on your system.<br>
:small_orange_diamond: <ahref="https://www.nongnu.org/tiger/"><b>Tiger</b></a> - is a security tool that can be use both as a security audit and intrusion detection system.<br>
:small_orange_diamond: <ahref="https://cisofy.com/lynis/"><b>Lynis</b></a> - battle-tested security tool for systems running Linux, macOS, or Unix-based operating system.<br>
:small_orange_diamond: <ahref="https://github.com/installation/rkhunter"><b>Rkhunter</b></a> - scanner tool for Linux systems that scans backdoors, rootkits and local exploits on your systems.<br>
:small_orange_diamond: <ahref="https://github.com/hasherezade/pe-sieve"><b>PE-sieve</b></a> - is a light-weight tool that helps to detect malware running on the system.<br>
:small_orange_diamond: <ahref="http://dtrace.org/blogs/about/"><b>DTrace</b></a> - is a performance analysis and troubleshooting tool.<br>
:small_orange_diamond: <ahref="https://en.wikipedia.org/wiki/Ltrace"><b>ltrace</b></a> - is a library call tracer, used to trace calls made by programs to library functions.<br>
:small_orange_diamond: <ahref="https://github.com/brainsmoke/ptrace-burrito"><b>ptrace-burrito</b></a> - is a friendly wrapper around ptrace.<br>
:small_orange_diamond: <ahref="https://github.com/brendangregg/perf-tools"><b>perf-tools</b></a> - performance analysis tools based on Linux perf_events (aka perf) and ftrace.<br>
:small_orange_diamond: <ahref="https://github.com/draios/sysdig"><b>sysdig</b></a> - system exploration and troubleshooting tool with first class support for containers.<br>
:small_orange_diamond: <ahref="http://www.valgrind.org/"><b>Valgrind</b></a> - is an instrumentation framework for building dynamic analysis tools.<br>
:small_orange_diamond: <ahref="https://nicolargo.github.io/glances/"><b>glances</b></a> - cross-platform system monitoring tool written in Python.<br>
:small_orange_diamond: <ahref="https://github.com/hishamhm/htop"><b>htop</b></a> - interactive text-mode process viewer for Unix systems. It aims to be a better 'top'.<br>
:small_orange_diamond: <ahref="https://en.wikipedia.org/wiki/Lsof"><b>lsof</b></a> - displays in its output information about files that are opened by processes.<br>
:small_orange_diamond: <ahref="https://github.com/zevv/lsofgraph"><b>lsofgraph</b></a> - small utility to convert Unix lsof output to a graph showing FIFO and UNIX interprocess communication.<br>
:small_orange_diamond: <ahref="https://github.com/mozilla/rr"><b>rr</b></a> - is a lightweight tool for recording, replaying and debugging execution of applications.<br>
:small_orange_diamond: <ahref="https://github.com/rcoh/angle-grinder"><b>angle-grinder</b></a> - slice and dice log files on the command line.<br>
:small_orange_diamond: <ahref="https://goaccess.io/"><b>GoAccess</b></a> - real-time web log analyzer and interactive viewer that runs in a terminal.<br>
:small_orange_diamond: <ahref="https://github.com/dbcli/pgcli"><b>pgcli</b></a> - postgres CLI with autocompletion and syntax highlighting.<br>
:small_orange_diamond: <ahref="https://github.com/dbcli/mycli"><b>mycli</b></a> - terminal client for MySQL with autocompletion and syntax highlighting.<br>
:small_orange_diamond: <ahref="https://github.com/dbcli/litecli"><b>litecli</b></a> - SQLite CLI with autocompletion and syntax highlighting.<br>
:small_orange_diamond: <ahref="https://github.com/osquery/osquery"><b>OSQuery</b></a> - is a SQL powered operating system instrumentation, monitoring, and analytics framework.<br>
:small_orange_diamond: <ahref="https://github.com/GouveaHeitor/nipe"><b>Nipe</b></a> - script to make Tor Network your default gateway.<br>
:small_orange_diamond: <ahref="https://github.com/trimstray/multitor"><b>multitor</b></a> - a tool that lets you create multiple TOR instances with a load-balancing.<br>
:small_orange_diamond: <ahref="https://github.com/rgburke/grv"><b>GRV</b></a> - is a terminal based interface for viewing Git repositories.<br>
:small_orange_diamond: <ahref="https://github.com/Guake/guake"><b>Guake</b></a> - is a dropdown terminal made for the GNOME desktop environment.<br>
:small_orange_diamond: <ahref="https://gnometerminator.blogspot.com/p/introduction.html"><b>Terminator</b></a> - is based on GNOME Terminal, useful features for sysadmins and other users.<br>
:small_orange_diamond: <ahref="https://sw.kovidgoyal.net/kitty/"><b>Kitty</b></a> - is a GPU based terminal emulator that supports smooth scrolling and images.<br>
:small_orange_diamond: <ahref="https://www.wireshark.org/"><b>Wireshark</b></a> - is the world’s foremost and widely-used network protocol analyzer.<br>
:small_orange_diamond: <ahref="https://jmeter.apache.org/"><b>JMeter™</b></a> - open source software to load test functional behavior and measure performance.<br>
:small_orange_diamond: <ahref="https://github.com/locustio/locust"><b>locust</b></a> - scalable user load testing tool written in Python.<br>
:small_orange_diamond: <ahref="https://www.torproject.org/"><b>TOR Browser</b></a> - protect your privacy and defend yourself against network surveillance and traffic analysis.<br>
:small_orange_diamond: <ahref="https://keepassxc.org/"><b>KeePassXC</b></a> - store your passwords safely and auto-type them into your everyday websites and apps.<br>
:small_orange_diamond: <ahref="https://www.signal.org/"><b>Signal</b></a> - is an encrypted communications app.<br>
:small_orange_diamond: <ahref="https://wire.com/en/"><b>Wire</b></a> - secure messaging, file sharing, voice calls and video conferences. All protected with end-to-end encryption.<br>
:small_orange_diamond: <ahref="https://github.com/prof7bit/TorChat"><b>TorChat</b></a> - decentralized anonymous instant messenger on top of Tor Hidden Services.<br>
:small_orange_diamond: <ahref="https://www.sublimetext.com/3"><b>Sublime Text</b></a> - is a lightweight, cross-platform code editor known for its speed, ease of use.<br>
:small_orange_diamond: <ahref="https://code.visualstudio.com/"><b>Visual Studio Code</b></a> - an open-source and free source code editor developed by Microsoft.<br>
:small_orange_diamond: <ahref="https://www.ssllabs.com/ssltest/viewMyClient.html"><b>SSL/TLS Capabilities of Your Browser</b></a> - test your browser's SSL implementation.<br>
:small_orange_diamond: <ahref="https://caniuse.com/"><b>Can I use</b></a> - provides up-to-date browser support tables for support of front-end web technologies.<br>
:small_orange_diamond: <ahref="https://panopticlick.eff.org/"><b>Panopticlick 3.0</b></a> - is your browser safe against tracking?<br>
:small_orange_diamond: <ahref="https://privacy.net/analyzer/"><b>Privacy Analyzer</b></a> - see what data is exposed from your browser.<br>
:small_orange_diamond: <ahref="https://www.howsmyssl.com/"><b>How's My SSL?</b></a> - help a web server developer learn what real world TLS clients were capable of.<br>
:small_orange_diamond: <ahref="https://www.ssllabs.com/ssltest/"><b>SSLLabs Server Test</b></a> - free online service performs a deep analysis of the configuration of any SSL web server.<br>
:small_orange_diamond: <ahref="https://dev.ssllabs.com/ssltest/"><b>SSLLabs Server Test (DEV)</b></a> - free online service performs a deep analysis of the configuration of any SSL web server.<br>
:small_orange_diamond: <ahref="https://report-uri.com/home/tools"><b>Report URI</b></a> - monitoring security policies like CSP and HPKP.<br>
:small_orange_diamond: <ahref="https://csp-evaluator.withgoogle.com/"><b>CSP Evaluator</b></a> - allows developers and security experts to check if a Content Security Policy.<br>
:small_orange_diamond: <ahref="https://uselesscsp.com/"><b>Useless CSP</b></a> - public list about CSP in some big players (might make them care a bit more).<br>
:small_orange_diamond: <ahref="https://whynohttps.com/"><b>Why No HTTPS?</b></a> - list of the world's top 100 websites by Alexa rank not automatically redirecting insecure requests.<br>
:small_orange_diamond: <ahref="https://badssl.com/"><b>badssl.com</b></a> - memorable site for testing clients against bad SSL configs.<br>
:small_orange_diamond: <ahref="https://ccadb.org/resources"><b>Common CA Database</b></a> - repository of information about CAs, and their root and intermediate certificates.<br>
:small_orange_diamond: <ahref="https://crt.sh/"><b>crt.sh</b></a> - discovers certificates by continually monitoring all of the publicly known CT.<br>
:small_orange_diamond: <ahref="https://cryptcheck.fr/suite/"><b>Cipher suite compatibility</b></a> - test TLS cipher suite compatibility.<br>
:small_orange_diamond: <ahref="https://www.urlvoid.com/"><b>urlvoid</b></a> - this service helps you detect potentially malicious websites.<br>
:small_orange_diamond: <ahref="https://securitytxt.org/"><b>security.txt</b></a> - a proposed standard (generator) which allows websites to define security policies.<br>
:small_orange_diamond: <ahref="https://securityheaders.com/"><b>Security Headers</b></a> - analyse the HTTP response headers (with rating system to the results).<br>
:small_orange_diamond: <ahref="https://observatory.mozilla.org/"><b>Observatory by Mozilla</b></a> - set of tools to analyze your website.<br>
:small_orange_diamond: <ahref="https://webhint.io/"><b>webhint</b></a> - is a linting tool that will help you with your site's accessibility, speed, security and more.<br>
:small_orange_diamond: <ahref="https://www.buddyns.com/delegation-lab/"><b>BuddyDNS Delegation LAB</b></a> - check, trace and visualize delegation of your domain.<br>
:small_orange_diamond: <ahref="https://dnssec-debugger.verisignlabs.com/"><b>dnssec-debugger</b></a> - DS or DNSKEY records validator.<br>
:small_orange_diamond: <ahref="http://ptrarchive.com/"><b>PTRarchive.com</b></a> - this site is responsible for the safekeeping of historical reverse DNS records.<br>
:small_orange_diamond: <ahref="https://ceipam.eu/en/dnslookup.php"><b>dnslookup (ceipam)</b></a> - one of the best DNS propagation checker (and not only).<br>
:small_orange_diamond: <ahref="https://mxtoolbox.com/SuperTool.aspx"><b>MX Toolbox</b></a> - all of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool.<br>
:small_orange_diamond: <ahref="http://www.blacklistalert.org/"><b>blacklistalert</b></a> - checks to see if your domain is on a Real Time Spam Blacklist.<br>
:small_orange_diamond: <ahref="http://multirbl.valli.org/"><b>MultiRBL</b></a> - complete IP check for sending Mailservers.<br>
##### :black_small_square: Encoders/Decoders and Regex testing
<p>
:small_orange_diamond: <ahref="https://www.url-encode-decode.com/"><b>URL Encode/Decode</b></a> - tool from above to either encode or decode a string of text.<br>
:small_orange_diamond: <ahref="https://uncoder.io/"><b>Uncoder</b></a> - the online translator for search queries on log data.<br>
:small_orange_diamond: <ahref="https://regex101.com/"><b>Regex101</b></a> - online regex tester and debugger: PHP, PCRE, Python, Golang and JavaScript.<br>
:small_orange_diamond: <ahref="https://regexr.com/"><b>RegExr</b></a> - online tool to learn, build, & test Regular Expressions (RegEx / RegExp).<br>
:small_orange_diamond: <ahref="https://gchq.github.io/CyberChef/"><b>The Cyber Swiss Army Knife</b></a> - a web app for encryption, encoding, compression and data analysis.<br>
:small_orange_diamond: <ahref="https://toolbar.netcraft.com/site_report"><b>Netcraft</b></a> - detailed report about the site, helping you to make informed choices about their integrity.<b>*</b><br>
:small_orange_diamond: <ahref="https://www.ripe.net/"><b>RIPE NCC</b></a> - not-for-profit membership association, a Regional Internet Registry and the secretariat for the RIPE.<br>
:small_orange_diamond: <ahref="https://www.robtex.com/"><b>Robtex</b></a> - uses various sources to gather public information about IP numbers, domain names, host names, routes etc.<br>
:small_orange_diamond: <ahref="https://extendsclass.com/"><b>Online Tools for Developers</b></a> - HTTP API tools, testers, encoders, converters, formatters, and other tools.<br>
:small_orange_diamond: <ahref="https://riseup.net/"><b>Riseup</b></a> - provides online communication tools for people and groups working on liberatory social change.<br>
:small_orange_diamond: <ahref="https://www.virustotal.com/gui/home/upload"><b>VirusTotal</b></a> - analyze suspicious files and URLs to detect types of malware.<br>
:small_orange_diamond: <ahref="https://www.privacytools.io/"><b>privacytools.io</b></a> - provides knowledge and tools to protect your privacy against global mass surveillance.<br>
:small_orange_diamond: <ahref="https://dnsprivacy.org/wiki/display/DP/DNS+Privacy+Test+Servers"><b>DNS Privacy Test Servers</b></a> - DNS privacy recursive servers list (with a 'no logging' policy).<br>
:small_orange_diamond: <ahref="http://sandbox.onlinephpfunctions.com/"><b>PHP Sandbox</b></a> - test your PHP code with this code tester.<br>
:small_orange_diamond: <ahref="https://www.repl.it/"><b>Repl.it</b></a> - an instant IDE to learn, build, collaborate, and host all in one place.<br>
:small_orange_diamond: <ahref="https://developers.google.com/speed/pagespeed/insights/"><b>PageSpeed Insights</b></a> - analyze your site’s speed and make it faster.<br>
:small_orange_diamond: <ahref="https://web.dev/"><b>web.dev</b></a> - helps developers like you learn and apply the web's modern capabilities to your own sites and apps.<br>
:small_orange_diamond: <ahref="https://github.com/GoogleChrome/lighthouse"><b>Lighthouse</b></a> - automated auditing, performance metrics, and best practices for the web.<br>
##### :black_small_square: Mass scanners (search engines)
<p>
:small_orange_diamond: <ahref="https://censys.io/"><b>Censys</b></a> - platform that helps information security practitioners discover, monitor, and analyze devices.<br>
:small_orange_diamond: <ahref="https://www.shodan.io/"><b>Shodan</b></a> - the world's first search engine for Internet-connected devices.<br>
:small_orange_diamond: <ahref="https://2000.shodan.io/#/"><b>Shodan 2000</b></a> - do you use Shodan for everyday work? This tool looks for randomly generated data from Shodan.<br>
:small_orange_diamond: <ahref="https://viz.greynoise.io/table"><b>GreyNoise</b></a> - mass scanner such as Shodan and Censys.<br>
:small_orange_diamond: <ahref="https://www.zoomeye.org/"><b>ZoomEye</b></a> - search engine for cyberspace that lets the user find specific network components.<br>
:small_orange_diamond: <ahref="https://netograph.io/"><b>netograph</b></a> - tools to monitor and understand deep structure of the web.<br>
:small_orange_diamond: <ahref="https://fofa.so/"><b>FOFA</b></a> - is a cyberspace search engine.<br>
:small_orange_diamond: <ahref="https://www.onyphe.io/"><b>onyphe</b></a> - is a search engine for open-source and cyber threat intelligence data collected.<br>
:small_orange_diamond: <ahref="https://app.binaryedge.io/"><b>binaryedge</b></a> - it scan the entire internet space and create real-time threat intelligence streams and reports.<br>
:small_orange_diamond: <ahref="https://wigle.net/"><b>wigle</b></a> - is a submission-based catalog of wireless networks. All the networks. Found by Everyone.<br>
:small_orange_diamond: <ahref="https://publicwww.com/"><b>PublicWWW</b></a> - find any alphanumeric snippet, signature or keyword in the web pages HTML, JS and CSS code.<br>
:small_orange_diamond: <ahref="https://inteltechniques.com/menu.html"><b>IntelTechniques</b></a> - this repository contains hundreds of online search utilities.<br>
:small_orange_diamond: <ahref="https://hunter.io/"><b>hunter</b></a> - lets you find email addresses in seconds and connect with the people that matter for your business.<br>
:small_orange_diamond: <ahref="https://ghostproject.fr/"><b>GhostProject?</b></a> - search by full email address or username.<br>
:small_orange_diamond: <ahref="https://www.databreaches.live/"><b>databreaches</b></a> - was my email affected by data breach?<br>
:small_orange_diamond: <ahref="https://buckets.grayhatwarfare.com/"><b>Buckets by Grayhatwarfar</b></a> - database with public search for Open Amazon S3 Buckets and their contents.<br>
:small_orange_diamond: <ahref="https://vigilante.pw/"><b>Vigilante.pw</b></a> - the breached database directory.<br>
:small_orange_diamond: <ahref="https://builtwith.com/"><b>builtwith</b></a> - find out what websites are built with.<br>
:small_orange_diamond: <ahref="https://www.mmnt.net/"><b>Mamont's open FTP Index</b></a> - if a target has an open FTP site with accessible content it will be listed here.<br>
:small_orange_diamond: <ahref="https://osintframework.com/"><b>OSINT Framework</b></a> - focused on gathering information from free tools or resources.<br>
:small_orange_diamond: <ahref="https://www.maltiverse.com/search"><b>maltiverse</b></a> - is a service oriented to cybersecurity analysts for the advanced analysis of indicators of compromise.<br>
:small_orange_diamond: <ahref="https://leakedsource.ru/main/"><b>Leaked Source</b></a> - is a collaboration of data found online in the form of a lookup.<br>
:small_orange_diamond: <ahref="https://pipl.com/"><b>pipl</b></a> - is the place to find the person behind the email address, social username or phone number.<br>
:small_orange_diamond: <ahref="https://abuse.ch/"><b>abuse.ch</b></a> - is operated by a random swiss guy fighting malware for non-profit.<br>
:small_orange_diamond: <ahref="https://cybercrime-tracker.net/index.php"><b>Cybercrime Tracker</b></a> - monitors and tracks various malware families that are used to perpetrate cyber crimes.<br>
:small_orange_diamond: <ahref="https://searchcode.com/"><b>searchcode</b></a> - helping you find real world examples of functions, API's and libraries.<br>
:small_orange_diamond: <ahref="http://www.insecam.org/"><b>Insecam</b></a> - the world biggest directory of online surveillance security cameras.<br>
:small_orange_diamond: <ahref="https://haveibeenpwned.com/"><b>have i been pwned?</b></a> - check if you have an account that has been compromised in a data breach.<br>
:small_orange_diamond: <ahref="https://www.exploit-db.com/"><b>Exploit DB</b></a> - CVE compliant archive of public exploits and corresponding vulnerable software.<br>
:small_orange_diamond: <ahref="https://0day.today/"><b>0day.today</b></a> - exploits market provides you the possibility to buy zero-day exploits and also to sell 0day exploits.<br>
:small_orange_diamond: <ahref="https://sploitus.com/"><b>sploitus</b></a> - the exploit and tools database.<br>
:small_orange_diamond: <ahref="https://www.vulncode-db.com/"><b>Vulncode-DB</b></a> - is a database for vulnerabilities and their corresponding source code if available.<br>
:small_orange_diamond: <ahref="https://www.immuniweb.com/mobile/"><b>ImmuniWeb® Mobile App Scanner</b></a> - test security and privacy of mobile apps (iOS & Android).<br>
:small_orange_diamond: <ahref="https://www.ostorlab.co/scan/mobile/"><b>Ostorlab</b></a> - analyzes mobile application to identify vulnerabilities and potential weaknesses.<br>
:small_orange_diamond: <ahref="https://countermail.com/"><b>CounterMail</b></a> - is a secure and easy to use online email service, designed to provide maximum security and privacy.<br>
:small_orange_diamond: <ahref="http://mail2tor.com/"><b>Mail2Tor</b></a> - is a Tor Hidden Service that allows anyone to send and receive emails anonymously.<br>
:small_orange_diamond: <ahref="https://tutanota.com/"><b>Tutanota</b></a> - is the world's most secure email service and amazingly easy to use.<br>
:small_orange_diamond: <ahref="https://protonmail.com/"><b>Protonmail</b></a> - is the world's largest secure email service, developed by CERN and MIT scientists.<br>
:small_orange_diamond: <ahref="https://keyserver.ubuntu.com/"><b>SKS OpenPGP Key server</b></a> - services for the SKS keyservers used by OpenPGP.<br>
:small_orange_diamond: <ahref="https://hardenedbsd.org/"><b>HardenedBSD</b></a> - HardenedBSD aims to implement innovative exploit mitigation and security solutions.<br>
:small_orange_diamond: <ahref="https://www.kali.org/"><b>Kali Linux</b></a> - Linux distribution used for Penetration Testing, Ethical Hacking and network security assessments.<br>
:small_orange_diamond: <ahref="https://www.backbox.org/"><b>Backbox Linux</b></a> - penetration test and security assessment oriented Ubuntu-based Linux distribution.<br>
:small_orange_diamond: <ahref="https://blackarch.org/"><b>BlackArch</b></a> - is an Arch Linux-based penetration testing distribution for penetration testers and security researchers.<br>
:small_orange_diamond: <ahref="https://securityonion.net/"><b>Security Onion</b></a> - Linux distro for intrusion detection, enterprise security monitoring, and log management.<br>
:small_orange_diamond: <ahref="https://tails.boum.org/"><b>Tails</b></a> - is a live system that aims to preserve your privacy and anonymity.<br>
:small_orange_diamond: <ahref="https://varnish-cache.org/"><b>Varnish Cache</b></a> - HTTP accelerator designed for content-heavy dynamic web sites.<br>
:small_orange_diamond: <ahref="https://nginx.org/"><b>Nginx</b></a> - open source web and reverse proxy server that is similar to Apache, but very light weight.<br>
:small_orange_diamond: <ahref="https://github.com/alibaba/tengine"><b>Tengine</b></a> - a distribution of Nginx with some advanced features.<br>
:small_orange_diamond: <ahref="https://caddyserver.com/"><b>Caddy Server</b></a> - is an open source, HTTP/2-enabled web server with HTTPS by default.<br>
:small_orange_diamond: <ahref="https://www.knot-resolver.cz/"><b>Knot Resolver</b></a> - caching full resolver implementation, including both a resolver library and a daemon.<br>
:small_orange_diamond: <ahref="https://www.powerdns.com/"><b>PowerDNS</b></a> - is an open source authoritative DNS server, written in C++ and licensed under the GPL.<br>
:small_orange_diamond: <ahref="https://twitter.com/EmeraldOnion"><b>Emerald Onion</b></a> - is a 501(c)(3) nonprofit organization and transit internet service provider (ISP) based in Seattle.<br>
:small_orange_diamond: <ahref="https://github.com/pi-hole/pi-hole"><b>pi-hole</b></a> - the Pi-hole® is a DNS sinkhole that protects your devices from unwanted content.<br>
:small_orange_diamond: <ahref="https://github.com/Netflix/security_monkey"><b>security_monkey</b></a> - monitors AWS, GCP, OpenStack, and GitHub orgs for assets and their changes over time.<br>
:small_orange_diamond: <ahref="https://github.com/firecracker-microvm/firecracker"><b>firecracker</b></a> - secure and fast microVMs for serverless computing.<br>
:small_orange_diamond: <ahref="https://www.capanalysis.net/ca/"><b>CapAnalysis</b></a> - web visual tool to analyze large amounts of captured network traffic (PCAP analyzer).<br>
:small_orange_diamond: <ahref="https://github.com/digitalocean/netbox"><b>netbox</b></a> - IP address management (IPAM) and data center infrastructure management (DCIM) tool.<br>
:small_orange_diamond: <ahref="https://labs.networkreliability.engineering/"><b>NRE Labs</b></a> - learn automation by doing it. Right now, right here, in your browser.<br>
:small_orange_diamond: <ahref="https://ee.lbl.gov/"><b>LBNL's Network Research Group</b></a> - home page of the Network Research Group (NRG); tools, talks, papers and more.<br>
:small_orange_diamond: <ahref="https://github.com/bcicen/ctop"><b>ctop</b></a> - top-like interface for container metrics.<br>
:small_orange_diamond: <ahref="https://github.com/docker/docker-bench-security"><b>docker-bench-security</b></a> - is a script that checks for dozens of common best-practices around deploying Docker.<br>
</p>
##### :black_small_square: Web Tools
<p>
:small_orange_diamond: <ahref="https://github.com/moby/moby"><b>Moby</b></a> - a collaborative project for the container ecosystem to assemble container-based system.<br>
:small_orange_diamond: <ahref="https://traefik.io/"><b>Traefik</b></a> - open source reverse proxy/load balancer provides easier integration with Docker and Let's encrypt.<br>
:small_orange_diamond: <ahref="https://github.com/Kong/kong"><b>kong</b></a> - The Cloud-Native API Gateway.<br>
:small_orange_diamond: <ahref="https://github.com/wsargent/docker-cheat-sheet"><b>docker-cheat-sheet</b></a> - a quick reference cheat sheet on Docker.<br>
:small_orange_diamond: <ahref="https://github.com/veggiemonk/awesome-docker"><b>awesome-docker</b></a> - a curated list of Docker resources and projects.<br>
:small_orange_diamond: <ahref="https://github.com/yeasy/docker_practice"><b>docker_practice</b></a> - learn and understand Docker technologies, with real DevOps practice!<br>
</b></a> - is a collection of tutorials for learning how to use Docker with various tools.<br>
:small_orange_diamond: <ahref="https://github.com/jessfraz/dockerfiles"><b>dockerfiles</b></a> - various Dockerfiles I use on the desktop and on servers.<br>
:small_orange_diamond: <ahref="https://github.com/kelseyhightower/kubernetes-the-hard-way"><b>kubernetes-the-hard-way</b></a> - bootstrap Kubernetes the hard way on Google Cloud Platform. No scripts.<br>
:small_orange_diamond: <ahref="https://github.com/jamesward/kubernetes-the-easy-way"><b>kubernetes-the-easy-way</b></a> - bootstrap Kubernetes the easy way on Google Cloud Platform. No scripts.<br>
:small_orange_diamond: <ahref="https://github.com/kabachook/k8s-security"><b>k8s-security</b></a> - kubernetes security notes and best practices.<br>
:small_orange_diamond: <ahref="https://learnk8s.io/production-best-practices/"><b>kubernetes-production-best-practices</b></a> - Checklists with best-practices for production-ready Kubernetes.<br>
:small_orange_diamond: <ahref="https://github.com/dylanaraps/pure-bash-bible"><b>pure-bash-bible</b></a> - is a collection of pure bash alternatives to external processes.<br>
:small_orange_diamond: <ahref="https://github.com/dylanaraps/pure-sh-bible"><b>pure-sh-bible</b></a> - is a collection of pure POSIX sh alternatives to external processes.<br>
:small_orange_diamond: <ahref="https://wiki.bash-hackers.org/start"><b>The Bash Hackers Wiki</b></a> - hold documentation of any kind about GNU Bash.<br>
:small_orange_diamond: <ahref="http://pubs.opengroup.org/onlinepubs/9699919799/utilities/contents.html"><b>Shell & Utilities</b></a> - describes the commands and utilities offered to application programs by POSIX-conformant systems.<br>
:small_orange_diamond: <ahref="https://github.com/jlevy/the-art-of-command-line"><b>the-art-of-command-line</b></a> - master the command line, in one page.<br>
:small_orange_diamond: <ahref="https://awesome-python.com/"><b>Awesome Python</b></a> - a curated list of awesome Python frameworks, libraries, software and resources.<br>
:small_orange_diamond: <ahref="https://www.pythoncheatsheet.org/"><b>pythoncheatsheet.org</b></a> - basic reference for beginner and advanced developers.<br>
:small_orange_diamond: <ahref="https://posts.specterops.io/fawk-yeah-advanced-sed-and-awk-usage-parsing-for-pentesters-3-e5727e11a8ad?gi=c8f9506b26b6"><b>F’Awk Yeah!</b></a> - advanced sed and awk usage (Parsing for Pentesters 3).<br>
:small_orange_diamond: <ahref="https://www.cyberciti.biz/"><b>nixCraft</b></a> - linux and unix tutorials for new and seasoned sysadmin.<br>
:small_orange_diamond: <ahref="http://www.omnisecu.com/index.php"><b>Omnisecu</b></a> - free Networking, System Administration and Security tutorials.<br>
:small_orange_diamond: <ahref="http://cb.vu/unixtoolbox.xhtml"><b>Unix Toolbox</b></a> - collection of Unix/Linux/BSD commands and tasks which are useful for IT work or for advanced users.<br>
:small_orange_diamond: <ahref="https://linuxguideandhints.com/"><b>Linux Guide and Hints</b></a> - tutorials on system administration in Fedora and CentOS.<br>
:small_orange_diamond: <ahref="https://github.com/NanXiao/strace-little-book"><b>strace-little-book</b></a> - a little book which introduces strace.<br>
:small_orange_diamond: <ahref="https://github.com/bagder/http2-explained"><b>http2-explained</b></a> - a detailed document explaining and documenting HTTP/2.<br>
:small_orange_diamond: <ahref="https://github.com/bagder/http3-explained"><b>http3-explained</b></a> - a document describing the HTTP/3 and QUIC protocols.<br>
:small_orange_diamond: <ahref="https://github.com/trimstray/nginx-admins-handbook"><b>Nginx Admin's Handbook</b></a> - describes how to improve NGINX performance, security and other important things.<br>
:small_orange_diamond: <ahref="https://infosec.mozilla.org/guidelines/openssh"><b>openssh guideline</b></a> - is to help operational teams with the configuration of OpenSSH server and client.<br>
:small_orange_diamond: <ahref="https://packetlife.net/"><b>PacketLife.net</b></a> - a place to record notes while studying for Cisco's CCNP certification.<br>
:small_orange_diamond: <ahref="https://github.com/infosecn1nja/AD-Attack-Defense"><b>AD-Attack-Defense</b></a> - attack and defend active directory using modern post exploitation adversary tradecraft activity.<br>
:small_orange_diamond: <ahref="https://github.com/donnemartin/system-design-primer"><b>The System Design Primer</b></a> - learn how to design large-scale systems.<br>
:small_orange_diamond: <ahref="https://github.com/binhnguyennus/awesome-scalability"><b>Awesome Scalability</b></a> - best practices in building High Scalability, High Availability, High Stability and more.<br>
:small_orange_diamond: <ahref="https://www.cisecurity.org/cis-benchmarks/"><b>CIS Benchmarks</b></a> - are secure configuration settings for over 100 technologies, available as a free PDF download.<br>
:small_orange_diamond: <ahref="https://highon.coffee/blog/security-harden-centos-7/"><b>Security Harden CentOS 7</b></a> - this walks you through the steps required to security harden CentOS.<br>
:small_orange_diamond: <ahref="https://www.lisenet.com/2017/centos-7-server-hardening-guide/"><b>CentOS 7 Server Hardening Guide</b></a> - great guide for hardening CentOS; familiar with OpenSCAP.<br>
:small_orange_diamond: <ahref="https://github.com/trimstray/the-practical-linux-hardening-guide"><b>The Practical Linux Hardening Guide</b></a> - provides a high-level overview of hardening GNU/Linux systems.<br>
:small_orange_diamond: <ahref="https://github.com/toniblyx/my-arsenal-of-aws-security-tools"><b>AWS security tools</b></a> - make your AWS cloud environment more secure.<br>
:small_orange_diamond: <ahref="https://inventory.rawsec.ml/index.html"><b>Rawsec's CyberSecurity Inventory</b></a> - an inventory of tools and resources about CyberSecurity.<br>
:small_orange_diamond: <ahref="https://tls.ulfheim.net/"><b>The Illustrated TLS Connection</b></a> - every byte of a TLS connection explained and reproduced.<br>
:small_orange_diamond: <ahref="https://github.com/ssllabs/research/wiki/SSL-and-TLS-Deployment-Best-Practices"><b>SSL Research</b></a> - SSL and TLS Deployment Best Practices by SSL Labs.<br>
:small_orange_diamond: <ahref="https://smallstep.com/blog/everything-pki.html"><b>Certificates and PKI</b></a> - everything you should know about certificates and PKI but are too afraid to ask.<br>
:small_orange_diamond: <ahref="https://appsecco.com/books/subdomain-enumeration/"><b>The Art of Subdomain Enumeration</b></a> - a reference for subdomain enumeration techniques.<br>
:small_orange_diamond: <ahref="https://lifehacker.com/the-comprehensive-guide-to-quitting-google-1830001964"><b>Quitting Google</b></a> - the comprehensive guide to quitting Google.<br>
:small_orange_diamond: <ahref="https://www.owasp.org/index.php/Main_Page"><b>OWASP</b></a> - worldwide not-for-profit charitable organization focused on improving the security of software.<br>
:small_orange_diamond: <ahref="https://github.com/Santandersecurityresearch/asvs"><b>OWASP ASVS 3.0.1 Web App</b></a> - simple web app that helps developers understand the ASVS requirements.<br>
:small_orange_diamond: <ahref="https://github.com/OWASP/ASVS/tree/master/4.0"><b>OWASP ASVS 4.0</b></a> - is a list of application security requirements or tests.<br>
:small_orange_diamond: <ahref="https://github.com/OWASP/DevGuide"><b>OWASP Dev Guide</b></a> - this is the development version of the OWASP Developer Guide.<br>
:small_orange_diamond: <ahref="https://infosec.mozilla.org/guidelines/web_security.html"><b>Mozilla Web Security</b></a> - help operational teams with creating secure web applications.<br>
:small_orange_diamond: <ahref="https://github.com/Netflix/security-bulletins"><b>security-bulletins</b></a> - security bulletins that relate to Netflix Open Source.<br>
:small_orange_diamond: <ahref="https://appsecwiki.com/#/"><b>Application Security Wiki</b></a> - is an initiative to provide all application security related resources at one place.<br>
:small_orange_diamond: <ahref="https://github.com/GrrrDog/weird_proxies/wiki"><b>Weird Proxies</b></a> - reverse proxy related attacks; it is a result of analysis of various reverse proxies, cache proxies, etc.<br>
:small_orange_diamond: <ahref="https://dfir.it/blog/2015/08/12/webshell-every-time-the-same-purpose/"><b>Webshells</b></a> - great series about malicious payloads.<br>
:small_orange_diamond: <ahref="https://portswigger.net/blog/practical-web-cache-poisoning"><b>Practical Web Cache Poisoning</b></a> - show you how to compromise websites by using esoteric web features.<br>
:small_orange_diamond: <ahref="https://github.com/bl4de/research/tree/master/hidden_directories_leaks"><b>Hidden directories and files</b></a> - as a source of sensitive information about web application.<br>
:small_orange_diamond: <ahref="https://www.netsparker.com/security-cookies-whitepaper/"><b>Security Cookies</b></a> - this paper will take a close look at cookie security.<br>
:small_orange_diamond: <ahref="https://github.com/GitGuardian/APISecurityBestPractices"><b>APISecurityBestPractices</b></a> - help you keep secrets (API keys, db credentials, certificates) out of source code.<br>
:small_orange_diamond: <ahref="https://devhints.io/"><b>Rico's cheatsheets</b></a> - this is a modest collection of cheatsheets.<br>
:small_orange_diamond: <ahref="https://devdocs.io/"><b>DevDocs API</b></a> - combines multiple API documentations in a fast, organized, and searchable interface.<br>
:small_orange_diamond: <ahref="https://bitvijays.github.io/LFC-VulnerableMachines.html"><b>CTF Series : Vulnerable Machines</b></a> - the steps below could be followed to find vulnerabilities and exploits.<br>
:small_orange_diamond: <ahref="https://github.com/manoelt/50M_CTF_Writeup"><b>50M_CTF_Writeup</b></a> - $50 million CTF from Hackerone - writeup.<br>
:small_orange_diamond: <ahref="https://github.com/j00ru/ctf-tasks"><b>ctf-tasks</b></a> - an archive of low-level CTF challenges developed over the years.<br>
:small_orange_diamond: <ahref="https://hshrzd.wordpress.com/how-to-start/"><b>How to start RE/malware analysis?</b></a> - collection of some hints and useful links for the beginners.<br>
:small_orange_diamond: <ahref="http://www.kegel.com/c10k.html"><b>The C10K problem</b></a> - it's time for web servers to handle ten thousand clients simultaneously, don't you think?<br>
:small_orange_diamond: <ahref="http://poormansprofiler.org/"><b>poor man's profiler</b></a> - sampling tools like dtrace's don't really provide methods to see what programs are blocking on.<br>
:small_orange_diamond: <ahref="https://nickcraver.com/blog/2017/05/22/https-on-stack-overflow/"><b>HTTPS on Stack Overflow</b></a> - this is the story of a long journey regarding the implementation of SSL.<br>
:small_orange_diamond: <ahref="https://drawings.jvns.ca/"><b>Julia's Drawings</b></a> - some drawings about programming and unix world, zines about systems & debugging tools.<br>
:small_orange_diamond: <ahref="https://github.com/corkami/collisions"><b>Hash collisions</b></a> - this great repository is focused on hash collisions exploitation.<br>
:small_orange_diamond: <ahref="https://labs.ripe.net/Members/cteusche/bgp-meets-cat"><b>BGP Meets Cat</b></a> - after 3072 hours of manipulating BGP, Job Snijders has succeeded in drawing a Nyancat.<br>
:small_orange_diamond: <ahref="https://github.com/alex/what-happens-when"><b>What happens when...</b></a> - you type google.com into your browser and press enter?<br>
:small_orange_diamond: <ahref="https://github.com/vasanthk/how-web-works"><b>how-web-works</b></a> - based on the 'What happens when...' repository.<br>
:small_orange_diamond: <ahref="https://robertheaton.com/2018/11/28/https-in-the-real-world/"><b>HTTPS in the real world</b></a> - great tutorial explain how HTTPS works in the real world.<br>
:small_orange_diamond: <ahref="https://about.gitlab.com/2018/11/14/how-we-spent-two-weeks-hunting-an-nfs-bug/"><b>Gitlab and NFS bug</b></a> - how we spent two weeks hunting an NFS bug in the Linux kernel.<br>
:small_orange_diamond: <ahref="https://about.gitlab.com/2017/02/10/postmortem-of-database-outage-of-january-31/"><b>Gitlab melts down</b></a> - postmortem on the database outage of January 31 2017 with the lessons we learned.<br>
:small_orange_diamond: <ahref="http://www.catb.org/esr/faqs/hacker-howto.html"><b>How To Become A Hacker</b></a> - if you want to be a hacker, keep reading.<br>
:small_orange_diamond: <ahref="http://ithare.com/infographics-operation-costs-in-cpu-clock-cycles/"><b>Operation Costs in CPU</b></a> - an infographics which should help to estimate costs of certain operations in CPU clocks.<br>
:small_orange_diamond: <ahref="https://cstack.github.io/db_tutorial/"><b>Let's Build a Simple Database</b></a> - writing a sqlite clone from scratch in C.<br>
:small_orange_diamond: <ahref="https://djhworld.github.io/post/2019/05/21/i-dont-know-how-cpus-work-so-i-simulated-one-in-code/"><b>simple-computer</b></a> - great resource to understand how computers work under the hood.<br>
:small_orange_diamond: <ahref="https://www.troyhunt.com/working-with-154-million-records-on/"><b>The story of "Have I been pwned?"</b></a> - working with 154 million records on Azure Table Storage.<br>
:small_orange_diamond: <ahref="https://www.top500.org/"><b>TOP500 Supercomputers</b></a> - shows the 500 most powerful commercially available computer systems known to us.<br>
:small_orange_diamond: <ahref="https://www.shellntel.com/blog/2017/2/8/how-to-build-a-8-gpu-password-cracker"><b>How to build a 8 GPU password cracker</b></a> - any "black magic" or hours of frustration like desktop components do.<br>
:small_orange_diamond: <ahref="https://home.cern/science/computing"><b>CERN Data Centre</b></a> - 3D visualizations of the CERN computing environments (and more).<br>
:small_orange_diamond: <ahref="http://howfuckedismydatabase.com/"><b>How fucked is my database</b></a> - evaluate how fucked your database is with this handy website.<br>
:small_orange_diamond: <ahref="http://howfuckedismydatabase.com/"><b>Five Whys</b></a> - you know what the problem is, but you cannot solve it?<br>
:small_orange_diamond: <ahref="https://github.com/learnbyexample/Command-line-text-processing"><b>Command-line-text-processing</b></a> - from finding text to search and replace, from sorting to beautifying text and more.<br>
:small_orange_diamond: <ahref="https://github.com/caesar0301/awesome-pcaptools"><b>Awesome Pcaptools</b></a> - collection of tools developed by other researchers to process network traces.<br>
:small_orange_diamond: <ahref="https://github.com/zoidbergwill/awesome-ebpf"><b>awesome-ebpf</b></a> - a curated list of awesome projects related to eBPF.<br>
:small_orange_diamond: <ahref="https://github.com/leandromoreira/linux-network-performance-parameters"><b>Linux Network Performance</b></a> - learn where some of the network sysctl variables fit into the Linux/Kernel network flow.<br>
:small_orange_diamond: <ahref="https://github.com/dhamaniasad/awesome-postgres"><b>Awesome Postgres</b></a> - list of awesome PostgreSQL software, libraries, tools and resources.<br>
:small_orange_diamond: <ahref="https://github.com/enochtangg/quick-SQL-cheatsheet"><b>quick-SQL-cheatsheet</b></a> - a quick reminder of all SQL queries and examples on how to use them.<br>
:small_orange_diamond: <ahref="https://github.com/Kickball/awesome-selfhosted"><b>Awesome-Selfhosted</b></a> - list of Free Software network services and web applications which can be hosted locally.<br>
:small_orange_diamond: <ahref="https://wiki.archlinux.org/index.php/List_of_applications"><b>List of applications</b></a> - huge collection of applications sorted by category, as a reference for those looking for packages. <br>
:small_orange_diamond: <ahref="https://github.com/kamranahmedse/developer-roadmap"><b>Web Developer Roadmap</b></a> - roadmaps, articles and resources to help you choose your path, learn and improve.<br>
:small_orange_diamond: <ahref="https://github.com/thedaviddias/Front-End-Checklist"><b>Front-End-Checklist</b></a> - the perfect Front-End Checklist for modern websites and meticulous developers.<br>
:small_orange_diamond: <ahref="https://rszalski.github.io/magicmethods/"><b>Python's Magic Methods</b></a> - what are magic methods? They're everything in object-oriented Python.<br>
:small_orange_diamond: <ahref="https://github.com/satwikkansal/wtfpython"><b>wtfpython</b></a> - a collection of surprising Python snippets and lesser-known features.<br>
:small_orange_diamond: <ahref="https://github.com/twhite96/js-dev-reads"><b>js-dev-reads</b></a> - a list of books and articles for the discerning web developer to read.<br>
:small_orange_diamond: <ahref="https://github.com/RomuloOliveira/commit-messages-guide"><b>Commit messages guide</b></a> - a guide to understand the importance of commit messages.<br>
:small_orange_diamond: <ahref="https://github.com/qazbnm456/awesome-web-security"><b>Awesome Web Security</b></a> - a curated list of Web Security materials and resources.<br>
:small_orange_diamond: <ahref="https://github.com/joe-shenouda/awesome-cyber-skills"><b>awesome-cyber-skills</b></a> - a curated list of hacking environments where you can train your cyber skills.<br>
:small_orange_diamond: <ahref="https://github.com/hslatman/awesome-threat-intelligence"><b>awesome-threat-intelligence</b></a> - a curated list of Awesome Threat Intelligence resources.<br>
:small_orange_diamond: <ahref="https://github.com/infosecn1nja/Red-Teaming-Toolkit"><b>Red-Teaming-Toolkit</b></a> - a collection of open source and commercial tools that aid in red team operations.<br>
:small_orange_diamond: <ahref="https://github.com/snoopysecurity/awesome-burp-extensions"><b>awesome-burp-extensions</b></a> - a curated list of amazingly awesome Burp Extensions.<br>
:small_orange_diamond: <ahref="https://github.com/Hack-with-Github/Free-Security-eBooks"><b>Free Security eBooks</b></a> - list of a Free Security and Hacking eBooks.<br>
:small_orange_diamond: <ahref="https://github.com/wtsxDev/reverse-engineering"><b>reverse-engineering</b></a> - list of awesome reverse engineering resources.<br>
:small_orange_diamond: <ahref="https://github.com/michalmalik/linux-re-101"><b>linux-re-101</b></a> - a collection of resources for linux reverse engineering.<br>
:small_orange_diamond: <ahref="https://github.com/onethawt/reverseengineering-reading-list"><b>reverseengineering-reading-list</b></a> - a list of Reverse Engineering articles, books, and papers.<br>
:small_orange_diamond: <ahref="https://github.com/0xInfection/Awesome-WAF"><b>Awesome-WAF</b></a> - a curated list of awesome web-app firewall (WAF) stuff.<br>
:small_orange_diamond: <ahref="https://github.com/danielmiessler/RobotsDisallowed"><b>RobotsDisallowed</b></a> - a curated list of the most common and most interesting robots.txt disallowed directories.<br>
:small_orange_diamond: <ahref="https://gist.github.com/joepie91/7e5cad8c0726fd6a5e90360a754fc568"><b>wildcard-certificates</b></a> - why you probably shouldn't use a wildcard certificate.<br>
:small_orange_diamond: <ahref="https://gist.github.com/joepie91/5a9909939e6ce7d09e29"><b>Don't use VPN services</b></a> - which is what every third-party "VPN provider" does.<br>
:small_orange_diamond: <ahref="https://github.com/InQuest/awesome-yara"><b>awesome-yara</b></a> - a curated list of awesome YARA rules, tools, and people.<br>
:small_orange_diamond: <ahref="https://github.com/k4m4/movies-for-hackers"><b>Movies for Hackers</b></a> - list of movies every hacker & cyberpunk must watch.<br>
:small_orange_diamond: <ahref="https://github.com/trimstray/technical-whitepapers"><b>technical-whitepapers</b></a> - IT whitepapers; hacking, web app security, db, reverse engineering and more; EN/PL.<br>
:small_orange_diamond: <ahref="https://www.cheatography.com/"><b>Cheatography</b></a> - over 3,000 free cheat sheets, revision aids and quick references.<br>
:small_orange_diamond: <ahref="https://github.com/mre/awesome-static-analysis"><b>awesome-static-analysis</b></a> - static analysis tools for all programming languages.<br>
:small_orange_diamond: <ahref="https://github.com/ossu/computer-science"><b>computer-science</b></a> - path to a free self-taught education in Computer Science.<br>
:small_orange_diamond: <ahref="https://github.com/danluu/post-mortems"><b>post-mortems</b></a> - is a collection of postmortems (config errors, hardware failures, and more).<br>
:small_orange_diamond: <ahref="https://www.youtube.com/watch?v=nAFpkV5-vuI"><b>Varnish for PHP developers</b></a> - very interesting presentation of Varnish by Mattias Geniar.<br>
:small_orange_diamond: <ahref="https://www.youtube.com/watch?v=CZ3wIuvmHeM"><b>A Netflix Guide to Microservices</b></a> - Josh Evans talks about the chaotic and vibrant world of microservices at Netflix.<br>
:small_orange_diamond: <ahref="https://www.youtube.com/watch?v=yOyaJXpAYZQ"><b>Comparing C to machine language</b></a> - compare a simple C program with the compiled machine code of that program.<br>
:small_orange_diamond: <ahref="http://www.brendangregg.com/"><b>Brendan Gregg's Blog</b></a> - is an industry expert in computing performance and cloud computing.<br>
:small_orange_diamond: <ahref="https://gynvael.coldwind.pl/"><b>Gynvael "GynDream" Coldwind</b></a> - is a IT security engineer at Google.<br>
:small_orange_diamond: <ahref="http://lcamtuf.coredump.cx/"><b>Michał "lcamtuf" Zalewski</b></a> - white hat hacker, computer security expert.<br>
:small_orange_diamond: <ahref="https://ma.ttias.be/"><b>Mattias Geniar</b></a> - developer, sysadmin, blogger, podcaster and public speaker.<br>
:small_orange_diamond: <ahref="https://nickcraver.com/"><b>Nick Craver</b></a> - software developer and systems administrator for Stack Exchange.<br>
:small_orange_diamond: <ahref="https://scotthelme.co.uk/"><b>Scott Helme</b></a> - security researcher, international speaker and founder of securityheaders.com and report-uri.com.<br>
:small_orange_diamond: <ahref="https://krebsonsecurity.com/"><b>Brian Krebs</b></a> - The Washington Post and now an Independent investigative journalist.<br>
:small_orange_diamond: <ahref="https://www.schneier.com/"><b>Bruce Schneier</b></a> - is an internationally renowned security technologist, called a "security guru".<br>
:small_orange_diamond: <ahref="https://chrissymorgan.co.uk/"><b>Chrissy Morgan</b></a> - advocate of practical learning, Chrissy also takes part in bug bounty programs.<br>
:small_orange_diamond: <ahref="https://blog.zsec.uk/"><b>Andy Gill</b></a> - is a hacker at heart who works as a senior penetration tester.<br>
:small_orange_diamond: <ahref="https://samy.pl/"><b>Samy Kamkar</b></a> - is an American privacy and security researcher, computer hacker.<br>
:small_orange_diamond: <ahref="https://www.j4vv4d.com/"><b>Javvad Malik</b></a> - is a security advocate at AlienVault, a blogger event speaker and industry commentator.<br>
:small_orange_diamond: <ahref="https://security.szurek.pl/"><b>Kacper Szurek</b></a> - detection engineer at ESET.<br>
:small_orange_diamond: <ahref="https://www.troyhunt.com/"><b>Troy Hunt</b></a> - web security expert known for public education and outreach on security topics.<br>
:small_orange_diamond: <ahref="https://raymii.org/s/index.html"><b>raymii.org</b></a> - sysadmin specializing in building high availability cloud environments.<br>
:small_orange_diamond: <ahref="https://robert.penz.name/"><b>Robert Penz</b></a> - IT security expert.<br>
:small_orange_diamond: <ahref="https://linux-audit.com/"><b>Linux Audit</b></a> - the Linux security blog about auditing, hardening and compliance by Michael Boelen.<br>
:small_orange_diamond: <ahref="http://www.grymoire.com/"><b>The Grymoire</b></a> - collection of useful incantations for wizards, be you computer wizards, magicians, or whatever.<br>
:small_orange_diamond: <ahref="https://portswigger.net/blog"><b>PortSwigger Web Security Blog</b></a> - about web app security vulns and top tips from our team of web security.<br>
:small_orange_diamond: <ahref="https://www.secjuice.com"><b>Secjuice</b></a> - is the only non-profit, independent and volunteer led publication in the information security space.<br>
:small_orange_diamond: <ahref="https://duo.com/decipher"><b>Decipher</b></a> - security news that informs and inspires.<br>
</p>
##### :black_small_square: Geeky Vendor Blogs
<p>
:small_orange_diamond: <ahref="https://www.tenable.com/podcast"><b>Tenable Podcast</b></a> - conversations and interviews related to Cyber Exposure, and more.<br>
:small_orange_diamond: <ahref="https://nakedsecurity.sophos.com/"><b>Sophos</b></a> - threat news room, giving you news, opinion, advice and research on computer security issues.<br>
:small_orange_diamond: <ahref="https://www.tripwire.com/state-of-security/"><b>Tripwire State of Security</b></a> - blog featuring the latest news, trends and insights on current information security issues.<br>
:small_orange_diamond: <ahref="https://blog.malwarebytes.com/"><b>Malwarebytes Labs Blog</b></a> - security blog aims to provide insider news about cybersecurity.<br>
:small_orange_diamond: <ahref="https://www.trustedsec.com/category/articles/"><b>TrustedSec</b></a> - latest news, and trends about cybersecurity.<br>
:small_orange_diamond: <ahref="https://thycotic.com/company/blog/"><b>Thycotic</b></a> - where CISOs and IT Admins come to learn about industry trends, IT security, data breaches, and more.<br>
:small_orange_diamond: <ahref="https://risky.biz/netcasts/risky-business/"><b>Risky Business</b></a> - is a weekly information security podcast featuring news and in-depth interviews.<br>
:small_orange_diamond: <ahref="https://www.vice.com/en_us/topic/cyber"><b>Cyber, by Motherboard</b></a> - stories, and focus on the ideas about cybersecurity.<br>
:small_orange_diamond: <ahref="https://www.tenable.com/podcast"><b>Tenable Podcast</b></a> - conversations and interviews related to Cyber Exposure, and more.<br>
Cybercrime Investigations</b></a> - podcast by Geoff White about cybercrimes.<br>
:small_orange_diamond: <ahref="https://themanyhats.club/tag/episodes/"><b>The many hats club</b></a> - featuring stories from a wide range of Infosec people (Whitehat, Greyhat and Blackhat).<br>
:small_orange_diamond: <ahref="https://darknetdiaries.com/"><b>Darknet Diaries</b></a> - true stories from the dark side of the Internet.<br>
:small_orange_diamond: <ahref="https://www.youtube.com/playlist?list=PL423I_gHbWUXah3dmt_q_XNp0NlGAKjis"><b>OSINTCurious Webcasts</b></a> - is the investigative curiosity that helps people be successful in OSINT.<br>
:small_orange_diamond: <ahref="https://www.youtube.com/user/SecurityWeeklyTV"><b>Security Weekly</b></a> - the latest information security and hacking news.<br>
:small_orange_diamond: <ahref="https://www.youtube.com/channel/UClcE-kVhqyiHCcjYwcpfj9w"><b>LiveOverflow</b></a> - a lot more advanced topics than what is typically offered in paid online courses - but for free.<br>
:small_orange_diamond: <ahref="https://www.youtube.com/infoseccynic"><b>J4vv4D</b></a> - the important information regarding our internet security.<br>
:small_orange_diamond: <ahref="https://twitter.com/MarcoCiappelli"><b>@MarcoCiappelli</b></a> - Co-Founder @ITSPmagazine, at the intersection of IT security and society.<br>
:small_orange_diamond: <ahref="https://twitter.com/binitamshah"><b>@binitamshah</b></a> - Linux Evangelist. Malwares. Kernel Dev. Security Enthusiast.<br>
:small_orange_diamond: <ahref="https://twitter.com/joe_carson"><b>@joe_carson</b></a> - an InfoSec Professional and Tech Geek.<br>
:small_orange_diamond: <ahref="https://twitter.com/esrtweet"><b>@esrtweet</b></a> - often referred to as ESR, is an American software developer, and open-source software advocate.<br>
:small_orange_diamond: <ahref="https://twitter.com/SwiftOnSecurity"><b>@SwiftOnSecurity</b></a> - systems security, industrial safety, sysadmin, author of decentsecurity.com.<br>
:small_orange_diamond: <ahref="https://twitter.com/dakami"><b>@dakami</b></a> - chief scientist at White Ops, is one of just seven people with the authority to restore the DNS root keys.<br>
:small_orange_diamond: <ahref="https://twitter.com/samykamkar"><b>@samykamkar</b></a> - is a famous "grey hat" hacker, security researcher, creator of the MySpace "Samy" worm.<br>
:small_orange_diamond: <ahref="https://twitter.com/matthew_d_green"><b>@matthew_d_green</b></a> - a cryptographer and professor at Johns Hopkins University.<br>
##### :black_small_square: Best Commercial Twitter Accounts
<p>
:small_orange_diamond: <ahref="https://twitter.com/haveibeenpwned"><b>@haveibeenpwned</b></a> - check if you have an account that has been compromised in a data breach.<br>
:small_orange_diamond: <ahref="https://twitter.com/bugcrowd"><b>@bugcrowd</b></a> - trusted by more of the Fortune 500 than any other crowdsourced security platform.<br>
:small_orange_diamond: <ahref="https://twitter.com/Malwarebytes"><b>@Malwarebytes</b></a> - most trusted security company. Unmatched threat visibility.<br>
:small_orange_diamond: <ahref="https://twitter.com/sansforensics"><b>@sansforensics</b></a> - the world's leading Digital Forensics and Incident Response provider.<br>
:small_orange_diamond: <ahref="https://twitter.com/TheManyHatsClub"><b>@TheManyHatsClub</b></a> - an information security focused podcast and group of individuals from all walks of life.<br>
:small_orange_diamond: <ahref="https://twitter.com/hedgehogsec"><b>@hedgehogsec</b></a> - Hedgehog Cyber. Gibraltar and Manchester's top boutique information security firm.<br>
:small_orange_diamond: <ahref="https://twitter.com/NCSC"><b>@NCSC</b></a> - the National Cyber Security Centre. Helping to make the UK the safest place to live and work online.<br>
:small_orange_diamond: <ahref="http://ftp.arl.army.mil/~mike/howto/"><b>How to Do Things at ARL</b></a> - how to configure modems, scan images, record CD-ROMs, and other useful techniques.<b>*</b><br>
:small_orange_diamond: <ahref="http://www.syhunt.com/sandcat/"><b>Sandcat Browser</b></a> - a penetration-oriented browser with plenty of advanced functionality already built in.<br>
:small_orange_diamond: <ahref="https://www.metasploit.com/"><b>Metasploit</b></a> - tool and framework for pentesting system, web and many more, contains a lot a ready to use exploit.<br>
:small_orange_diamond: <ahref="https://portswigger.net/burp"><b>Burp Suite</b></a> - tool for testing web application security, intercepting proxy to replay, inject, scan and fuzz HTTP requests.<br>
:small_orange_diamond: <ahref="https://mitmproxy.org/"><b>mitmproxy</b></a> - an interactive TLS-capable intercepting HTTP proxy for penetration testers and software developers.<br>
:small_orange_diamond: <ahref="https://cirt.net/Nikto2"><b>Nikto2</b></a> - web server scanner which performs comprehensive tests against web servers for multiple items.<br>
:small_orange_diamond: <ahref="http://sqlmap.org/"><b>sqlmap</b></a> - tool that automates the process of detecting and exploiting SQL injection flaws.<br>
:small_orange_diamond: <ahref="https://github.com/lanmaster53/recon-ng"><b>Recon-ng</b></a> - is a full-featured Web Reconnaissance framework written in Python.<br>
:small_orange_diamond: <ahref="https://github.com/GitHackTools/BillCipher"><b>BillCipher</b></a> - information gathering tool for a website or IP address.<br>
:small_orange_diamond: <ahref="https://github.com/Ekultek/WhatWaf"><b>WhatWaf</b></a> - detect and bypass web application firewalls and protection systems.<br>
:small_orange_diamond: <ahref="https://www.openwall.com/john/"><b>John The Ripper</b></a> - is a fast password cracker, currently available for many flavors of Unix, Windows, and other.<br>
:small_orange_diamond: <ahref="https://hashcat.net/hashcat/"><b>hashcat</b></a> - world's fastest and most advanced password recovery utility.<br>
:small_orange_diamond: <ahref="http://lcamtuf.coredump.cx/p0f3/"><b>p0f</b></a> - is a tool to identify the players behind any incidental TCP/IP communications.<br>
:small_orange_diamond: <ahref="https://github.com/mozilla/ssh_scan"><b>ssh_scan</b></a> - a prototype SSH configuration and policy scanner.<br>
:small_orange_diamond: <ahref="https://github.com/woj-ciech/LeakLooker"><b>LeakLooker</b></a> - find open databases - powered by Binaryedge.io<br>
:small_orange_diamond: <ahref="https://github.com/offensive-security/exploitdb"><b>exploitdb</b></a> - searchable archive from The Exploit Database.<br>
:small_orange_diamond: <ahref="https://github.com/zardus/ctf-tools"><b>ctf-tools</b></a> - some setup scripts for security research tools.<br>
:small_orange_diamond: <ahref="https://github.com/Gallopsled/pwntools"><b>pwntools</b></a> - CTF framework and exploit development library.<br>
:small_orange_diamond: <ahref="https://github.com/bl4de/security-tools"><b>security-tools</b></a> - collection of small security tools created mostly in Python. CTFs, pentests and so on.<br>
:small_orange_diamond: <ahref="https://github.com/fuzzdb-project/fuzzdb"><b>fuzzdb</b></a> - dictionary of attack patterns and primitives for black-box application fault injection and resource discovery.<br>
:small_orange_diamond: <ahref="https://github.com/google/syzkaller"><b>syzkaller</b></a> - is an unsupervised, coverage-guided kernel fuzzer.<br>
:small_orange_diamond: <ahref="https://github.com/pwndbg/pwndbg"><b>pwndbg</b></a> - exploit development and reverse engineering with GDB made easy.<br>
:small_orange_diamond: <ahref="https://www.hex-rays.com/products/ida/index.shtml"><b>IDA</b></a> - multi-processor disassembler and debugger useful for reverse engineering malware.<br>
:small_orange_diamond: <ahref="https://github.com/radare/radare2"><b>radare2</b></a> - framework for reverse-engineering and analyzing binaries.<br>
:small_orange_diamond: <ahref="https://github.com/NationalSecurityAgency/ghidra"><b>Ghidra</b></a> - is a software reverse engineering (SRE) framework.<br>
:small_orange_diamond: <ahref="https://github.com/sc0tfree/mentalist"><b>Mentalist</b></a> - is a graphical tool for custom wordlist generation.<br>
:small_orange_diamond: <ahref="https://github.com/archerysec/archerysec"><b>archerysec</b></a> - vulnerability assessment and management helps to perform scans and manage vulnerabilities.<br>
:small_orange_diamond: <ahref="https://github.com/TH3xACE/SUDO_KILLER"><b>SUDO_KILLER</b></a> - is a tool to identify and exploit sudo rules' misconfigurations and vulnerabilities.<br>
:small_orange_diamond: <ahref="https://www.amanhardikar.com/mindmaps/Practice.html"><b>Pentests MindMap</b></a> - amazing mind map with vulnerable apps and systems.<br>
:small_orange_diamond: <ahref="https://www.amanhardikar.com/mindmaps/webapptest.html"><b>WebApps Security Tests MindMap</b></a> - incredible mind map for WebApps security tests.<br>
:small_orange_diamond: <ahref="https://portswigger.net/web-security/cross-site-scripting/cheat-sheet"><b>XSS cheat sheet</b></a> - contains many vectors that can help you bypass WAFs and filters.<br>
:small_orange_diamond: <ahref="https://jivoi.github.io/2015/07/03/offensive-security-bookmarks/"><b>Offensive Security Bookmarks</b></a> - security bookmarks collection, all that things I need to pass OSCP.<br>
:small_orange_diamond: <ahref="https://github.com/coreb1t/awesome-pentest-cheat-sheets"><b>Awesome Pentest Cheat Sheets</b></a> - collection of the cheat sheets useful for pentesting.<br>
:small_orange_diamond: <ahref="https://github.com/Hack-with-Github/Awesome-Hacking"><b>Awesome Hacking by HackWithGithub</b></a> - awesome lists for hackers, pentesters and security researchers.<br>
:small_orange_diamond: <ahref="https://github.com/carpedm20/awesome-hacking"><b>Awesome Hacking by carpedm20</b></a> - a curated list of awesome hacking tutorials, tools and resources.<br>
:small_orange_diamond: <ahref="https://github.com/vitalysim/Awesome-Hacking-Resources"><b>Awesome Hacking Resources</b></a> - collection of hacking/penetration testing resources to make you better.<br>
:small_orange_diamond: <ahref="https://github.com/enaqx/awesome-pentest"><b>Awesome Pentest</b></a> - collection of awesome penetration testing resources, tools and other shiny things.<br>
:small_orange_diamond: <ahref="https://www.peerlyst.com/posts/the-complete-list-of-infosec-related-cheat-sheets-claus-cramon"><b>Penetration Testing and WebApp Cheat Sheets</b></a> - the complete list of Infosec related cheat sheets.<br>
:small_orange_diamond: <ahref="https://github.com/The-Art-of-Hacking/h4cker"><b>Cyber Security Resources</b></a> - includes thousands of cybersecurity-related references and resources.<br>
:small_orange_diamond: <ahref="https://github.com/jhaddix/pentest-bookmarks"><b>Pentest Bookmarks</b></a> - there are a LOT of pentesting blogs.<br>
:small_orange_diamond: <ahref="https://github.com/Cyb3rWard0g/ThreatHunter-Playbook"><b>ThreatHunter-Playbook</b></a> - to aid the development of techniques and hypothesis for hunting campaigns.<br>
:small_orange_diamond: <ahref="https://github.com/swisskyrepo/PayloadsAllTheThings"><b>PayloadsAllTheThings</b></a> - a list of useful payloads and bypass for Web Application Security and Pentest/CTF.<br>
:small_orange_diamond: <ahref="https://github.com/foospidy/payloads"><b>payloads</b></a> - git all the Payloads! A collection of web attack payloads.<br>
:small_orange_diamond: <ahref="https://cheatsheetseries.owasp.org/"><b>OWASP Cheat Sheet Series</b></a> - is a collection of high value information on specific application security topics.<br>
:small_orange_diamond: <ahref="https://jeremylong.github.io/DependencyCheck/index.html"><b>OWASP dependency-check</b></a> - is an open source solution the OWASP Top 10 2013 entry.<br>
:small_orange_diamond: <ahref="https://github.com/rshipp/awesome-malware-analysis"><b>Awesome Malware Analysis</b></a> - a curated list of awesome malware analysis tools and resources.<br>
:small_orange_diamond: <ahref="https://www.netsparker.com/blog/web-security/sql-injection-cheat-sheet/"><b>SQL Injection Cheat Sheet</b></a> - detailed technical information about the many different variants of the SQL Injection.<br>
:small_orange_diamond: <ahref="http://kb.entersoft.co.in/"><b>Entersoft Knowledge Base</b></a> - great and detailed reference about vulnerabilities.<br>
:small_orange_diamond: <ahref="http://html5sec.org/"><b>HTML5 Security Cheatsheet</b></a> - a collection of HTML5 related XSS attack vectors.<br>
:small_orange_diamond: <ahref="http://evuln.com/tools/xss-encoder/"><b>XSS String Encoder</b></a> - for generating XSS code to check your input validation filters against XSS.<br>
:small_orange_diamond: <ahref="https://gtfobins.github.io/"><b>GTFOBins</b></a> - list of Unix binaries that can be exploited by an attacker to bypass local security restrictions.<br>
:small_orange_diamond: <ahref="https://guif.re/"><b>Guifre Ruiz Notes</b></a> - collection of security, system, network and pentest cheatsheets.<br>
:small_orange_diamond: <ahref="http://blog.safebuff.com/2016/07/03/SSRF-Tips/index.html"><b>SSRF Tips</b></a> - a collection of SSRF Tips.<br>
:small_orange_diamond: <ahref="https://github.com/orangetw/My-CTF-Web-Challenges"><b>My-CTF-Web-Challenges</b></a> - collection of CTF Web challenges.<br>
:small_orange_diamond: <ahref="https://github.com/OWASP/owasp-mstg"><b>MSTG</b></a> - The Mobile Security Testing Guide (MSTG) is a comprehensive manual for mobile app security testing.<br>
:small_orange_diamond: <ahref="https://github.com/sdcampbell/Internal-Pentest-Playbook"><b>Internal-Pentest-Playbook</b></a> - notes on the most common things for an Internal Network Penetration Test.<br>
:small_orange_diamond: <ahref="https://github.com/streaak/keyhacks"><b>KeyHacks</b></a> - shows quick ways in which API keys leaked by a bug bounty program can be checked.<br>
:small_orange_diamond: <ahref="https://github.com/securitum/research"><b>securitum/research</b></a> - various Proof of Concepts of security research performed by Securitum.<br>
:small_orange_diamond: <ahref="https://github.com/bartblaze/PHP-backdoors"><b>PHP-backdoors</b></a> - a collection of PHP backdoors. For educational or testing purposes only.<br>
##### :black_small_square: Wordlists and Weak passwords
<p>
:small_orange_diamond: <ahref="https://weakpass.com/"><b>Weakpass</b></a> - for any kind of bruteforce find wordlists or unleash the power of them all at once!<br>
:small_orange_diamond: <ahref="https://hashes.org/"><b>Hashes.org</b></a> - is a free online hash resolving service incorporating many unparalleled techniques.<br>
:small_orange_diamond: <ahref="https://github.com/danielmiessler/SecLists"><b>SecLists</b></a> - collection of multiple types of lists used during security assessments, collected in one place.<br>
:small_orange_diamond: <ahref="https://github.com/berzerk0/Probable-Wordlists"><b>Probable-Wordlists</b></a> - sorted by probability originally created for password generation and testing.<br>
:small_orange_diamond: <ahref="https://bezpieka.org/polski-slownik-premium-polish-wordlist"><b>Polish PREMIUM Dictionary</b></a> - official dictionary created by the team on the forum bezpieka.org.<b>*</b><sup><ahref="https://sourceforge.net/projects/kali-linux/files/Wordlist/">1</sup><br>
:small_orange_diamond: <ahref="https://github.com/insidetrust/statistically-likely-usernames"><b>statistically-likely-usernames</b></a> - wordlists for creating statistically likely username lists for use in password attacks.<br>
:small_orange_diamond: <ahref="https://www.openbugbounty.org/"><b>Openbugbounty</b></a> - allows any security researcher reporting a vulnerability on any website.<br>
:small_orange_diamond: <ahref="https://www.hackerone.com/"><b>hackerone</b></a> - global hacker community to surface the most relevant security issues.<br>
:small_orange_diamond: <ahref="https://www.bugcrowd.com/"><b>bugcrowd</b></a> - crowdsourced cybersecurity for the enterprise.<br>
:small_orange_diamond: <ahref="https://www.owasp.org/index.php/OWASP_Vulnerable_Web_Applications_Directory_Project"><b>OWASP-VWAD</b></a> - comprehensive and well maintained registry of all known vulnerable web applications.<br>
:small_orange_diamond: <ahref="https://github.com/stamparm/DSVW"><b>DSVW</b></a> - is a deliberately vulnerable web application written in under 100 lines of code.<br>
:small_orange_diamond: <ahref="https://www.owasp.org/index.php/OWASP_Juice_Shop_Project"><b>OWASP Juice Shop Project</b></a> - the most bug-free vulnerable application in existence.<br>
:small_orange_diamond: <ahref="https://github.com/iteratec/juicy-ctf"><b>juicy-ctf</b></a> - run Capture the Flags and Security Trainings with OWASP Juice Shop.<br>
:small_orange_diamond: <ahref="https://www.owasp.org/index.php/Category:OWASP_WebGoat_Project"><b>OWASP WebGoat Project</b></a> - insecure web application maintained by OWASP designed to teach web app security.<br>
:small_orange_diamond: <ahref="https://github.com/opendns/Security_Ninjas_AppSec_Training"><b>Security Ninjas</b></a> - open source application security training program.<br>
:small_orange_diamond: <ahref="https://google-gruyere.appspot.com/"><b>Google Gruyere</b></a> - web application exploits and defenses.<br>
:small_orange_diamond: <ahref="https://github.com/amolnaik4/bodhi"><b>Bodhi</b></a> - is a playground focused on learning the exploitation of client-side web vulnerabilities.<br>
:small_orange_diamond: <ahref="https://websploit.h4cker.org/"><b>Websploit</b></a> - single vm lab with the purpose of combining several vulnerable appliations in one environment.<br>
:small_orange_diamond: <ahref="https://github.com/vulhub/vulhub"><b>vulhub</b></a> - pre-built Vulnerable Environments based on docker-compose.<br>
:small_orange_diamond: <ahref="https://rhinosecuritylabs.com/aws/introducing-cloudgoat-2/"><b>CloudGoat 2</b></a> - the new & improved "Vulnerable by Design"
:small_orange_diamond: <ahref="https://github.com/globocom/secDevLabs"><b>secDevLabs</b></a> - is a laboratory for learning secure web development in a practical manner.<br>
:small_orange_diamond: <ahref="https://github.com/incredibleindishell/CORS-vulnerable-Lab"><b>CORS-vulnerable-Lab</b></a> - sample vulnerable code and its exploit code.<br>
:small_orange_diamond: <ahref="https://www.offensive-security.com/"><b>Offensive Security</b></a> - true performance-based penetration testing training for over a decade.<br>
:small_orange_diamond: <ahref="https://www.hackthebox.eu/"><b>Hack The Box</b></a> - online platform allowing you to test your penetration testing skills.<br>
:small_orange_diamond: <ahref="http://pwnable.kr/index.php"><b>pwnable.kr</b></a> - non-commercial wargame site which provides various pwn challenges regarding system exploitation.<br>
:small_orange_diamond: <ahref="https://pwnable.tw/"><b>Pwnable.tw</b></a> - is a wargame site for hackers to test and expand their binary exploiting skills.<br>
:small_orange_diamond: <ahref="https://picoctf.com/"><b>picoCTF</b></a> - is a free computer security game targeted at middle and high school students.<br>
:small_orange_diamond: <ahref="https://ctflearn.com/"><b>CTFlearn</b></a> - is an online platform built to help ethical hackers learn and practice their cybersecurity knowledge and skills.<br>
:small_orange_diamond: <ahref="https://ctftime.org/"><b>ctftime</b></a> - CTF archive and a place, where you can get some another CTF-related info.<br>
:small_orange_diamond: <ahref="https://practicalpentestlabs.com/"><b>Practical Pentest Labs</b></a> - pentest lab, take your Hacking skills to the next level.<br>
:small_orange_diamond: <ahref="https://www.root-me.org/?lang=en"><b>Root Me</b></a> - the fast, easy, and affordable way to train your hacking skills.<br>
:small_orange_diamond: <ahref="https://hackxor.net/"><b>hackxor</b></a> - is a realistic web application hacking game, designed to help players of all abilities develop their skills.<br>
:small_orange_diamond: <ahref="http://overthewire.org/wargames/"><b>OverTheWire</b></a> - can help you to learn and practice security concepts in the form of fun-filled games.<br>
:small_orange_diamond: <ahref="https://labs.wizard-security.net/"><b>Wizard Labs</b></a> - is an online Penetration Testing Lab.<br>
:small_orange_diamond: <ahref="https://pentesterlab.com/"><b>PentesterLab</b></a> - provides vulnerable systems that can be used to test and understand vulnerabilities.<br>
:small_orange_diamond: <ahref="https://ringzer0ctf.com/"><b>RingZer0</b></a> - tons of challenges designed to test and improve your hacking skills.<br>
:small_orange_diamond: <ahref="http://www.try2hack.nl/"><b>try2hack</b></a> - several security-oriented challenges for your entertainment.<br>
:small_orange_diamond: <ahref="https://lab.pentestit.ru/"><b>Pentestit</b></a> - emulate IT infrastructures of real companies for legal pen testing and improving penetration testing skills.<br>
:small_orange_diamond: <ahref="https://microcorruption.com/login"><b>Microcorruption</b></a> - reversal challenges done in the web interface.<br>
:small_orange_diamond: <ahref="https://crackmes.one/"><b>Crackmes</b></a> - download crackmes to help improve your reverse engineering skills.<br>
:small_orange_diamond: <ahref="http://overthewire.org/wargames/"><b>OverTheWire</b></a> - can help you to learn and practice security concepts in the form of fun-filled games.<br>
:small_orange_diamond: <ahref="https://www.vulnhub.com/"><b>Vulnhub</b></a> - allows anyone to gain practical 'hands-on' experience in digital security.<br>
:small_orange_diamond: <ahref="https://w3challs.com/"><b>W3Challs</b></a> - is a penetration testing training platform, which offers various computer challenges.<br>
:small_orange_diamond: <ahref="https://ringzer0ctf.com/challenges"><b>RingZer0 CTF</b></a> - offers you tons of challenges designed to test and improve your hacking skills.<br>
:small_orange_diamond: <ahref="https://hack.me/"><b>Hack.me</b></a> - a platform where you can build, host and share vulnerable web apps for educational and research purposes.<br>
:small_orange_diamond: <ahref="https://www.hackthis.co.uk/levels/"><b>HackThis!</b></a> - discover how hacks, dumps and defacements are performed and secure your website against hackers.<br>
:small_orange_diamond: <ahref="https://www.enigmagroup.org/#"><b>Enigma Group WebApp Training</b></a> - these challenges cover the exploits listed in the OWASP Top 10 Project.<br>
:small_orange_diamond: <ahref="https://challenges.re/"><b>Reverse Engineering Challenges</b></a> - challenges, exercises, problems and tasks - by level, by type, and more.<br>
:small_orange_diamond: <ahref="https://0x00sec.org/"><b>0x00sec</b></a> - the home of the Hacker - Malware, Reverse Engineering, and Computer Science.<br>
:small_orange_diamond: <ahref="https://www.wechall.net/challs"><b>We Chall</b></a> - there are exist a lots of different challenge types.<br>
:small_orange_diamond: <ahref="https://www.hackergateway.com/"><b>Hacker Gateway</b></a> - is the go-to place for hackers who want to test their skills.<br>
:small_orange_diamond: <ahref="https://www.hacker101.com/"><b>Hacker101</b></a> - is a free class for web security.<br>
:small_orange_diamond: <ahref="https://contained.af/"><b>contained.af</b></a> - a stupid game for learning about containers, capabilities, and syscalls.<br>
:small_orange_diamond: <ahref="http://flaws.cloud/"><b>flAWS challenge!</b></a> - a series of levels you'll learn about common mistakes and gotchas when using AWS.<br>
:small_orange_diamond: <ahref="https://github.com/bugcrowd/bugcrowd_university"><b>Bugcrowd University</b></a> - open source education content for the researcher community.<br>
:small_orange_diamond: <ahref="https://github.com/rewardone/OSCPRepo"><b>OSCPRepo</b></a> - a list of resources and scripts that I have been gathering in preparation for the OSCP.<br>
:small_orange_diamond: <ahref="https://medium.com/@cxosmo/owasp-top-10-real-world-examples-part-1-a540c4ea2df5"><b>OWASP Top 10: Real-World Examples</b></a> - test your web apps with real-world examples (two-part series).<br>
:small_orange_diamond: <ahref="https://www.inoreader.com/"><b>Inoreader</b></a> - similar to feedly with a support for filtering what you fetch from rss.<br>
:small_orange_diamond: <ahref="https://thehackernews.com/"><b>The Hacker News</b></a> - leading news source dedicated to promoting awareness for security experts and hackers.<br>
:small_orange_diamond: <ahref="https://latesthackingnews.com/"><b>Latest Hacking News</b></a> - provides the latest hacking news, exploits and vulnerabilities for ethical hackers.<br>
:small_orange_diamond: <ahref="https://security.googleblog.com/"><b>Google Online Security Blog</b></a> - the latest news and insights from Google on security and safety on the Internet.<br>
:small_orange_diamond: <ahref="https://blog.qualys.com/"><b>Qualys Blog</b></a> - expert network security guidance and news.<br>
:small_orange_diamond: <ahref="https://www.darkreading.com/"><b>DARKReading</b></a> - connecting the Information Security Community.<br>
:small_orange_diamond: <ahref="https://twitter.com/disclosedh1"><b>publiclyDisclosed</b></a> - public disclosure watcher who keeps you up to date about the recently disclosed bugs.<br>
:small_orange_diamond: <ahref="https://www.reddit.com/r/hacking/"><b>Reddit - Hacking</b></a> - a subreddit dedicated to hacking and hackers.<br>
:small_orange_diamond: <ahref="https://sekurak.pl/"><b>Sekurak</b></a> - about security, penetration tests, vulnerabilities and many others (PL/EN).<br>
:small_orange_diamond: <ahref="https://nfsec.pl/"><b>nf.sec</b></a> - basic aspects and mechanisms of Linux operating system security (PL).<br>
:small_orange_diamond: <ahref="https://changelog.com/"><b>Changelog</b></a> - is a community of hackers; news & podcasts for developers and hackers.<br>
:small_orange_diamond: <ahref="https://calomel.org/unbound_dns.html"><b>Unbound DNS Tutorial</b></a> - a validating, recursive, and caching DNS server.<br>
:small_orange_diamond: <ahref="https://www.ctrl.blog/entry/knot-dns-resolver-tutorial.html"><b>Knot Resolver on Fedora</b></a> - how to get faster and more secure DNS resolution with Knot Resolver on Fedora.<br>
:small_orange_diamond: <ahref="https://www.aaflalo.me/2018/10/tutorial-setup-dns-over-https-server/"><b>DNS-over-HTTPS</b></a> - tutorial to setup your own DNS-over-HTTPS (DoH) server.<br>
:small_orange_diamond: <ahref="https://www.aaflalo.me/2019/03/dns-over-tls/"><b>DNS-over-TLS</b></a> - following to your DoH server, setup your DNS-over-TLS (DoT) server.<br>
:small_orange_diamond: <ahref="https://zwischenzugs.com/2018/01/26/how-and-why-i-run-my-own-dns-servers/"><b>DNS Servers</b></a> - how (and why) i run my own DNS Servers.<br>
:small_orange_diamond: <ahref="https://jamielinux.com/docs/openssl-certificate-authority/"><b>OpenSSL Certificate Authority</b></a> - build your own certificate authority (CA) using the OpenSSL command-line tools.<br>
:small_orange_diamond: <ahref="https://github.com/smallstep/certificates"><b>step-ca Certificate Authority</b></a> - build your own certificate authority (CA) using open source step-ca.<br>
:small_orange_diamond: <ahref="https://justinmeiners.github.io/lc3-vm/"><b>Write your Own Virtual Machine</b></a> - how to write your own virtual machine (VM).<br>
:small_orange_diamond: <ahref="https://github.com/cirosantilli/x86-bare-metal-examples"><b>x86 Bare Metal Examples</b></a> - dozens of minimal operating systems to learn x86 system programming.<br>
:small_orange_diamond: <ahref="https://github.com/djhworld/simple-computer"><b>simple-computer</b></a> - the scott CPU from "But How Do It Know?" by J. Clark Scott.<br>
> Look at this great explanation: [How to create multidomain certificates using config files](https://apfelboymchen.net/gnu/notes/openssl%20multidomain%20with%20config%20files.html)
