The Adventures of Jason - Java platformer in which one or more players jump around in a rectangular world, trying to catch stars and shoot each other. [Open Source, GPL]
BurgerSpace - BurgerTime clone for Linux, Windows, Mac, or BeOS in which you are a chef and must collect ingredients to make burgers.
Ladder - A classic ASCII based arcade game similar to Donkey Kong. (Requires the Java runtime environment.)
Robot Battle - An evolving programming game that allows players to design and build intelligent robots using a simple scripting language.
Super Pooch - A scrolling platformer for Windows similar to Super Mario.
TurboLode - 3D derivation of the game 'Lode Runner' for Windows with a real time stereoscopic mode.