Urban Terror
Urban Terror, commonly abbreviated as UrT, is a free multiplayer first-person shooter that runs on any engine compatible with Quake III Arena. It is available for Windows, Linux and Mac OS. "Where Quake meets reality" The game can be described as a Hollywood tactical shooter; it is based on a certain realism, but the motto is "fun not realism". The result is a very unique, entertaining and addictive game. Urban Terror has been a standalone game since 2007, when id Software released its id Tech 3 engine under the GPL license. Now it uses the latest ioquake3 engine, which is regularly updated and improved.