TESA (Tactics Editor for Squad Action) is a strategy editor for computer games. It allows the user to add team members to squads and edit actions they will perform in a squad-based game. It comes with all the map information needed for 32 player Battlefield 2 maps and is fully customizable to work with other games.
Jake2 is a pure Java port of the Quake2 game engine. It features OpenGL rendering using jogl and OpenAL sound using joal. To use the Jake2 engine, you need either the data files from the original game or from the demo version. An online installation of the demo levels is possible. A lwjgl driver is included as an alternative to the jogl/joal combination. Single player and multiplayer modes are working. Jake2 comes close to the performance of the original engine written in C.
BFM (Brutal Filemanager) is a mixture between a filemanager and a 3D shoot-'em-up game. In fact, you can't really manage the files yet, just shoot them up. Be carefull when using BFM! Some weapons, such as the shotgun, have spread. So files you didn't really aim at might get ... wasted. Start BFM with the '-s' for safemode and your files shall stay unhurt. It is written in Java and uses the Java3D API.
Vermin ExTerminator is a free multiplayer network game. It is a 2D real-time first-person shooter. Little worms (vermin) fight against each other using hand guns, rifles, grenades, or rockets. In other words, the game is mix of liero and a real-time worms. The game is written in Java with LWJGL as the OpenGL and OpenAL interface.
Q2Java is a game DLL for Quake2 that allows game code to be written in Java instead of C. It currently runs on Win32, Solaris, and Linux platforms. It takes advantange of many Java features including security, cross-platform binary compatibility, internationalization, dynamic classloading, just to name a few things.