.kkrieger (from Krieger, German for warrior) is a first-person shooter computer game created by the German demogroup .theprodukkt and won first place in the 96k game competition at Breakpoint in April 2004.

Tremulous is a free, open source game that blends a team based FPS with elements of an RTS. Players can choose from 2 unique races, aliens and humans.

FEAR Combat is the multiplayer part of FEAR that has been released for free.

a first-person shooter computer game that uses the Ageia PhysX engine.

Urban Terror can be described as a Hollywood tactical shooter; somewhat realism based, but the motto is "fun over realism". This results in a very unique, enjoyable and addictive game.

Celestial Impact is a team based multiplayer first person shooter (FPS) taking place on various asteroids floating in space.

Midway’s Area 51 is now available to download and play for FREE as an ad supported game. This is a full version with no time expiration sponsored by the US Air Force.

Gore - The Ultimate Soldier is an online multi-player game with a goal of providing classic hard core FPS action

PRISM: Guard Shield is a first person 3D shooter that contains a unique blend of stealth operations and fast action game play.

America's Army 3 is the only free action game that delivers an authentic and entertaining Army experience by reflecting the training, technology, actions and career advancement of a Soldier within a unique exciting game experience.