CTF Droids is a online multiplayer game based heavily on roborally, the 1994 board game created by Wizards of the Coast. The object of the game is to program your robot to reach flags before your opponents.
Faile is a free chess program which plays a fairly strong game of chess (Expert strength or better). One of the main goals of Faile is to provide a full featured chess program with source code which is tidy, well documented, and easy to understand.