Retro is a clean, minimalist language with roots in Forth. It supports all major OSes in use today, and was designed to be easy to learn, use, and modify for specific needs.
Atrack is an ntrack/Bittorrent tracker implementation designed to run on Google App Engine. The main goals in its design are minimalism and memory and CPU efficiency.
A CSS minifier.
A library that solves Freecell games.