OpenArena is an open source first-person shooter computer game based heavily on the Quake III Arena style deathmatch. The OpenArena project was first started on August 19, 2005, the day after the id Tech 3 GPL source code release.
OpenArena's greatest goal is to make a completely free, open source FPS game that derives itself strongly from Quake III. Its game engine is ioquake3, based upon id Software's GPL id Tech 3. OpenArena is entirely free as in speech, as the game engine, game code and data are all free and open content.
It is still in early development. In addition, a "missionpack" add-on is planned, to take advantage of the GPL'd Quake III: Team Arena source code.
The newest version of OpenArena 0.8.0 was released on August 8, 2008.