A Single Player MOD for Open Arena. The first release is a standalone version. Its campaign, when reseted, affects your Quake III and Open Arena progress. Now it works as a MOD. You extract the file content into your open arena folder and load MODS. It doesn't affect the Open Arena content.
A little demonstration of the mod for Open Arena, OARemix. Now it's working better and it's smaller and doesn't affect your usual Open Arena.