Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
BotBoxer - A first ever robotic punching bag with computer vision
Unreal Tournament - Unreal is a series of first-person shooter video games developed by Epic Games.
Timerly - A real interval timer
Red Eclipse - Red Eclipse is a fun-filled new take on the first person arena shooter, built as a total conversion...
ROBOCRAFT - Robocraft is an Action-Adventure, MMORPG, Vehicular-Combat, Shooter, Sci-Fi, Strategy, and PvP video game developed and published by Freejam.