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.
XBMC Blastdav is a simple WebDAV-like server for streaming content to XBMC. It works through proxies and tunnels, and even streams smoothly from a Raspberry Pi.
A fully configurable, open, and easy extendable HMI/SCADA application.
A documentation system for C++ and many other programming languages.