Robot Battle
- An evolving programming game that allows players to design and build intelligent robots using a simple scripting language.
- http://www.robotbattle.com/

TurboLode
- 3D derivation of the game 'Lode Runner' for Windows with a real time stereoscopic mode.
- http://eicart.free.fr/turbolode/

VideoToons
- Multiplayer Java platformer. [Open Source, GPL]
- http://videotoons.sourceforge.net/

Ladder
- A classic ASCII based arcade game similar to Donkey Kong. (Requires the Java runtime environment.)
- http://ostermiller.org/ladder/

Adventures of Johnny Jetpack
- Guide Johnny through his 3D world of platforms and lava to collect all the coins. (Open Source)
- http://www.johnnyjetpack.net/

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]
- http://javagame.sourceforge.net/