While it can be seen as a Q3/Quake Live successor, it has got major differences. Quake Champions ( QC in short) game followed in 2017. It used to be 'freemium', while nowadays it has changed to one-time buying game. Changes introduced during the years brought some details of its gameplay to noticeably differ from Q3. a working title was 'Quake Zero'), even more Online-focused than the original game. Id Software itself created a new version of Quake 3, called Quake Live ( QL for short. So, you can play a game very similar to the famous Q3A and use the improvements introduced by ioquake3, at no cost. OpenArena is totally stand-alone (you don't need the original Q3A) and free: all copyrighted material has been removed, everything has a free license. Since ioquake3 source code is free, it has been used to create OpenArena. This means that you must buy Quake 3 to be able to install and use ioquake3, and you can't share freely the whole thing. but to install it, it needs the textures, maps and 3d models from the original Quake 3, and they are still under copyright of id Software (only source code is free). ioquake3 source code is under GPL, and you can download the installer for free. ioquake3 uses a modified version of the id Tech 3 engine, resolves some bugs and adds various features, like support for IPv6. On August 19, 2005, id Software released the source code of the game under the GNU General Public License, allowing programmers to use it for free. Until 2005, various commercial games used licensed (and modified) versions of its engine (for example, Star Trek: Elite Force, or Star Wars: Jedi Knight 2). It does exist a port for the Sony PlayStation 2 console, which is named Quake III Revolution ( Q3R in short), and incorporates stuff from both Q3A and Team Arena, with some other twists. Latest version is 1.32c (one has to install the game, then 1.32 PointRelease, and then the 1.32c patch).

Id Software released some patches for the game, called PointReleases.

id Software itself created a commercial mod called Team Arena. and entire ' mods' that can change various aspects of the game. The game supports additional maps and character models. In Quake 3 you can fight against human players over LAN or Internet, or you can play offline against computer-controlled players called ' bots'. Previous games had a 'deatchmatch' multiplayer game mode, but these two games focused themselves on this game mode. Quake 3 and another game released that year ( Unreal Tournament) were different from previous FPS because of they didn't have single player 'story' game. 3 Compatibility for additional stuff designed for Quake 3 with OpenArena.

Quake 3 team arena