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.
Legends is a fast-paced first-person-perspective online multiplayer game. It is designed to take advantage of the beautiful environments available from the Torque engine it is based on, while still offering the breakneck pacing and variety of styles available from such classics as Quake and Tribes. The addition of a jetpack adds a new dimension to mobility.
Nexuiz is a fast-paced, chaotic, and intense multiplayer first-person shooter game, focused on providing basic, old style deathmatch. It is extremely modder-friendly. Nexuiz is built on the power of the Darkplaces engine, which is a heavily modified version of the original Quake. Darkplaces features realtime lighting and stencil shadows, bumpmapping, gloss, bloom, and totally rewritten network code that supports up to 64 players on a single server.
Tremulous is a computer game that blends a team-based first-person shooter with elements of realtime strategy. The objective of the game is to annihilate the opposing team. This is achieved by eliminating the opposing players and removing their ability to respawn by destroying their spawn structures.