Urban Terror is a free multiplayer first person shooter. Unlike old versions, Urban Terror no longer requires Quake III Arena. Urban Terror is available for Windows, Linux and Macintosh, the current version is 4.1.
Urban Terror can best be described as: "Where Quake meets reality"; it is realism based to a certain extent (environments/weapons/player models), but also goes by the motto: "fun over realism" (fast gameplay and lots of action). This combination of reality and action results in a very unique, enjoyable and addictive game.