NetworkSlime is an addictive 2-player network game. Two slimes battle it out in an electronic game of volleyball. This game is great fun and can be played in an office, on a campus, or over the Internet. The game uses a client/server archictecture and is written in Java. It is deployed using Java Web Start, which means that you can just click on the link to start the client or server.
Tic-tac-toe is an OpenGL game that focuses on graphical effects, specifically realistic 3D rendering of water. The water surface is procedurally generated, and the pieces float realistically on top of it. The water is textured, blended, and environment mapped. It is fully refracted and incorporates the Fresnel term for opacity.
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.