Sauerbraten - (Linux, Windows, Mac) Sauerbraten (a.k.a. Cube 2) is a free multiplayer/singleplayer first person shooter, built as a major redesign of the Cube FPS. Although Sauerbraten shares most of its design goals and philosophy with Cube, it sues a new 6-directional heightfield world model. This allowance provides much more complex level geometry and easier editing. Much like the original Cube, the aim of this game is not necessarily to produce the most features and eye candy possible, but rather to allow map/geometry editing to be done dynamically in-game, to create fun gameplay and an elegant engine. In addition to the FPS game which is in a very playable state, the engine is being used for an RPG which is in the preproduction phase. The scenes are reminiscent of Myst, with Gothic perspectives and realism. Price: Free.