Quake 3 Rally (2002)

Quake 3 Rally, also known as Q3Rally, is an open-source combat racing game on the ioquake3 engine, turning the classic Quake 3 into a racing shoot 'em up with many arena and racing gamemodes. Along with a plethora of mods, online support is also available. Q3R is very similar to the Half-Life Rally mod.