Alien Swarm is a game and Source SDK release from a group of talented designers at Valve who were hired from the Mod community. Available free of charge, the game thrusts players into an epic bug hunt featuring a unique blend of co-op play and squad-level tactics. With your friends, form a squad of four distinct IAF Marine classes.
Urban Terror™ is a free multiplayer first person shooter, that (thanks to ioquake3) does not require Quake III Arena. It is available for Windows, Linux and Macintosh.
OpenArena is an open source first-person shooter game based on the ioquake3 fork of the id tech 3 engine. OpenArena’s gameplay is the exact same as Quake III Arena – score frags to win the game using a balanced set of weapons each designed for different situations.
Warsow is a free standalone first person shooter game for Windows and Linux. It is based on the Qfusion 3D engine (a modification of the Quake 2 GPL engine), and aimed on the competitive scene, or the e-sports community.
Alien Arena a fast and frantic first person shooter that combines the best of gameplay from games like Unreal Tournament and Quake III.
Savage: The Battle for Newerth is a fantasy/science fiction computer game that combines aspects of Real-time strategy and First-person shooter into one game. The producers of the game define it as a ‘Real Time Strategy Shooter’, or ‘RTSS’. It takes place in the far future when man has (after an apocalypse) rebuilt society, but is threatened by intelligent beasts.
Sauerbraten (a.k.a. Cube 2) is a free multiplayer/singleplayer FPS, built as a major redesign of the Cube FPS. The aim of this game is to allow map/geometry editing to be done dynamically in-game, to create fun gameplay and an elegant engine
Nexuiz focuses on bringing the FPS genre back to the basics with quick, lethal battles and balanced weaponry. As of the current release there are 9 weapons and 24 official maps, as well as 15 player models, with an average of 2 skins each.
Tremulous blends a team based FPS with elements of an RTS. Players can choose from 2 unique races, aliens and humans. Players on both teams are able to build working structures in-game like an RTS.
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