Aleph One is a 3D first-person shooter game based on the game Marathon 2 by Bungie Software. It is set in a Sci-Fi universe dominated by deviant computer AIs and features a well thought-out plot. Aleph One was originally a MacOS game, but a cross-platform version ("Aleph One/SDL") based on the Simple DirectMedia Layer (SDL) library is currently under development which runs under Unix, BeOS, and Windows.
Unreal Tournament 2003 Demo is a self-booting Gentoo Linux-based LiveCD, allowing you to play the demo using any modern PC with an NVIDIA GeForce 2 or greater graphics card and a CD-ROM drive. It has full networking, complete OSS sound support, and additional Creative Soundblaster Live! and Audigy support included, allowing for the full gaming experience including LAN/Internet play, OpenAL environmental audio, and 3D accelerated OpenGL graphics.
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.