Counter-Strike - Counter-Strike is a PC-exclusive FPS video game developed by Valve Corporation.
Alien Shooter 2: Reloaded - Alien Shooter 2: Reloaded combines the elements of Role-playing, Top-down, Action, and Shooter.
Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
Assault Android Cactus - Assault Android Cactus is an Action, Arcade, Top-down Twin Stick Shooter, Co-op, Single and Multiplayer video game developed and published by Witch Beam.
Rage - Rage Software, also Rage Games and FX Digital Network, was a British video game developer.
Neon Chrome - Neon Chrome is an Action-Adventure, Top-down Perspective, Rogue-Like, Cyberpunk, Role-playing and Single-player Shooter video game developed and published by 10tons Ltd.