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 Xbox 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.
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.
Unvanquished is a free, open-source first-person shooter combining real-time strategy elements with a futuristic, sci-fi setting. It is available for Windows, Linux, and Mac OS X.
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.
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.
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.
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.
A Libre Multiplayer FPS Game built with Godot game engine and a fully FOSS toolchain.
A free-and-open-source first-person-shooter aimed at improving the classic game, AssaultCube!
Warface is a contemporary MMO first person shooter with millions of fans around the world. It offers intense PvP modes, compelling PvE missions and raids that you can challenge with four diverse classes and a colossal customizable arsenal.
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.
Jake2 is the most popular Web-based alternative to Urban Terror.
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