w3juke reads mp3 files from a web server and streams them into mpg123. It selects the tracks to be played at random based on your preferences (and avoiding recently played tracks). It also allows you to rate the tracks (or discs, or artists).
A game which looks like a Rubik's Cube, but is a slider, not a twister.
A telephony engine for PBX, IVR, and gateways.