Quake III Arena VS Counter-Strike

Arma 2: Operation Arrowhead - Arma 2: Operation Arrowhead is a Tactical, First-person Shooter, Single and Multiplayer video game created by Bohemia Interactive Studios and published by 505 Games.

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

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.

Unreal Tournament - Unreal is a series of first-person shooter video games developed by Epic Games.

Perfect Dark - Perfect Dark is an Awesome, Action-Adventure, Stealth, FPS (First-person Shooter), Single and Multiplayer video game developed by Rare and published by Nintendo.

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