A company named Bytonic has been sucessful in porting Quake 2 entirely to Java. On the site they show that the Java Quake 2 (Jake 2) can run up to 85% of the speed of the original C version. This is great because it shows that professional production quality games can be written entirely in Java. The entire source code is available through SourceForge. There is even a JNLP (Java Network Launching Protocol) Web Start version of Jake 2 which allows you to play the game online.
Site – http://www.bytonic.de
