Call of Duty - Call of Duty is a first-person and third-person shooter series by Infinity Ward.
Alien Shooter 2: Reloaded - Alien Shooter 2: Reloaded combines the elements of Role-playing, Top-down, Action, and Shooter.
Unreal Tournament - Unreal is a series of first-person shooter video games developed by Epic Games.
Alien Shooter - Alien Shooter is an Engaging, Action, Isometric, Role-playing, Top-down, and Single-player Shooter video game created and published by Sigma Team Inc.
Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
Alien Swarm - Alien Swarm is a F2P, Co-op, Alien, Top-down Shooter, Single and Multiplayer video game developed and published by Valve Corporation.