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

Call of Duty - Call of Duty is a first-person and third-person shooter series by Infinity Ward.

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

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

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

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