diff --git a/README.md b/README.md
index 5a401d6..909362a 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,7 @@
 * [Development](#development)
 * [Programming Languages](#programming-languages)
     * [Arduino](#arduino)
+    * [Crystal](#crystal)
     * [Elm](#elm)
     * [Haskell](#haskell)
     * [Node.js](#nodejs)
@@ -60,6 +61,7 @@
 
 ## Deployment Tools
 
+* [Colmena](https://github.com/zhaofengli/colmena) - A simple, stateless NixOS deployment tool modeled after NixOps and morph.
 * [krops](https://cgit.krebsco.de/krops/about/) - A lightweight toolkit to deploy NixOS systems, remotely or locally.
 * [KubeNix](https://github.com/xtruder/kubenix) - A Kubernetes resource builder using Nix.
 * [KuberNix](https://github.com/saschagrunert/kubernix) - Single-dependency Kubernetes clusters via Nix packages.
@@ -96,9 +98,13 @@
 
 * [nixduino](https://github.com/boredom101/nixduino) - Nix-based tool to help build Arduino sketches.
 
+### Crystal
+
+* [crystal2nix](https://github.com/nix-community/crystal2nix) - Convert `shard.lock` into Nix expressions.
+
 ### Elm
 
-* [elm2nix](https://github.com/hercules-ci/elm2nix) - Convert elm.json into Nix expressions.
+* [elm2nix](https://github.com/hercules-ci/elm2nix) - Convert `elm.json` into Nix expressions.
 
 ### Haskell