Clonk Rage - Real-time multiplayer game. Players can download more than 47475 maps at ccan.de

Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.

Endless Sky - A space exploration and combat game similar to Escape Velocity

Counter-Strike - Counter-Strike is a PC-exclusive FPS video game developed by Valve Corporation.

NAEV - Naev is a game about space exploration, trade and combat. Players travel the galaxy and earn money by trading, fighting and performing missions.

Quake - Quake is a series of first-person shooter video games released by id Software.