Urban Terror, commonly abbreviated as UrT, is a free multiplayer first person shooter developed, that will run on any Quake III Arena compatible engine. It is available for Windows, Linux and Mac OS. "Where Quake Meets Reality" The game 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. Urban Terror is a standalone game since 2007 when id Software released its id Tech 3 engine under the GPL license. It now uses the latest ioquake3 engine that it is regularily updated and improved.
