Warface - Warface - is a free online shooter with diverse PVP modes, exciting PVE missions, outstanding arsenal and millions of fans around the world!
Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
Shadow Warrior - Shadow Warrior by the famously known Flying Wild Hog is a mix-up of brilliant Action, First person Shooter and combat elements and offers a thrilling game-play and story to enjoy.
Quake - Quake is a series of first-person shooter video games released by id Software.
Hawken - Hawken is an Action, Free-to-play, FPS, Robots, Science-fiction, Tactical, Futuristic, MMO, Co-Op and Multiplayer video game created and published by Reloaded Games.
Counter-Strike - Counter-Strike is a PC-exclusive FPS video game developed by Valve Corporation.