Open Arena is a free and open source first-person shooter (FPS) computer game based heavily on the Quake III Arena style deathmatch. The OpenArena project was established on August 19, 2005, the day after the id Tech 3 GPL source code release. It is still in early development.
OpenArena's primary goal is to make a completely free, open source FPS game derived from Quake III. Its game engine is ioquake3, based upon id Software's GPL id Tech 3. 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 0.8.1 was released on October 31, 2008. The version 0.8.0 was removed because of the non-free content from the previous version.
OpenArena is available from the default repositories of a number of Linux distributions, including Debian, Fedora, Gentoo, Mandriva, and Ubuntu.
OpenArena's gameplay is the exact same as Quake III Arena - score frags to win the game using a balanced set of weapons each designed for different situations. Guns include a chaingun, rocket launcher, shotgun, and railgun. The Quake III style of play is very fast and requires skill to be played successfully online.
Gameplay modes exist such as Deathmatch, Team Deathmatch, Tournament, and Capture The Flag (all modes also in the original Quake III). OpenArena version 0.7.6 adds the new Elimination, CTF Elimination, Last Man Standing and Double Domination gametypes.
OpenArena has undergone compatibility testing with some Quake 3 mods and maps. Because "OpenArena" is not finished, many mods and maps from the original game are not compatible. A list of tested mods can be found at http://openarena.wikia.com/wiki/ModCompat
More recently OpenArena has advertised itself as a "sexy" first person shooter and warns that some models are near nude (only covered with tight clothing or hair), in addition to the game's violent theme, it is "not appropriate for children".