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OpenArena is NOT associated with id Software, Bethesda Softworks, Zenimax Media or the Quake trademark.
Although many OA players may have an history as Quake 3 players, it is not necessary to have played Quake series in order to enjoy OpenArena.

Q3A is Quake III Arena in short. OpenArena is a free game derivated from Quake 3 Arena. You don't need Q3A to play OpenArena. Many maps and mods created for Q3A work also in OpenArena.

For more info, please read: