If you have a GPS device and want to track the device on real-time basis on a map, Web GPS Tracker will allow you to do this. It is a quick and dirty (but working) application.
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.
runasdog (run as watchdog) is a tool that connects STDIO of any program to a listening TCP socket.
A simple social network with some project management features.
A simple CSS Framework for Web projects.