Phoronix: Spearmint, Macwerks/Watermint Engines Still Running

The Spearmint Game Engine, which aims to be a more impressive and feature-rich version of ioquake3, as well as Watermint, a "realistic" fork of Spearmint, are still actively being pursued...

http://www.phoronix.com/vr.php?view=MTM0NTM