Urban Terror is described as 'Started as a realism based "total conversion" mod for Quake III Arena. Nowadays, Urban Terror is played using the free, stand-alone, ioquake3 engine modified, which doesn't require Quake III Arena, in addition to being an add-on to id Software's' and is a first-person shooter in the games category. There are more than 25 games similar to Urban Terror for a variety of platforms, including Windows, Linux, Mac, Steam and Playstation apps. The best Urban Terror alternative is Xonotic, which is both free and Open Source. Other Urban Terror like games are Counter-Strike, Team Fortress 2, Unreal Tournament and Quake.
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. Players on both teams are able to build working structures in-game like an RTS.
United States
Warframe situates players as members of the Tenno race, newly awoken after years of cryo-sleep into a solar system at war. Reborn into a corrupt era, the Tenno are sought by the oppressive Grineer Empire for annihilation.
Canada
Digital Paint: Paintball 2 is a Paintball game that started out as a mod for quake 2 but then took on a life of its own as an open source fps game with a global player and clan management system.
United States
One of the most popular online action games of all time, Team Fortress Classic features over nine character classes -- from Medic to Spy to Demolition Man -- enlisted in a unique style of online team warfare.
United States
TrueCombat: Elite is a FREE modification for the Enemy Territory game (also free). It is a realistic modern day FPS featuring state of the art models and textures.
Wolfenstein is a series of video games centered around fighting back against the Nazi regime.
United States
Tom Clancy's Ghost Recon is an American video game series of military tactical shooters, created by Red Storm Entertainment, a game development studio founded in part by American author Tom Clancy.
United States
A free-and-open-source first-person-shooter aimed at improving the classic game, AssaultCube!
Canada
SPRAWL 96 is a celebration of our retro shooter SPRAWL, released for the first anniversary of SPRAWL's release. It’s also our way of giving thanks and giving back to the communities which made SPRAWL possible.
Jake2 is a Java 3D game engine. It is a port of the GPL’d Quake2 game engine from id Software. To use the Jake2 engine you need either the data files from the original game or from the demo version that is available for download from ftp://ftp.idsoftware.com.
Germany
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