Virtual World Engines
From FAS Virtual Worlds Almanac
Hopefully, we plan on creating a semantic template system for virtual world engines, like we already have with virtual worlds. But for now, here is a list:
Paperworld 3D: http://paperworld3d.com/ Paperworld 3D is a game engine development tool for Flash, intended to be used to create 3-D games and multi-user applications, in virtual worlds and elsewhere. It appears to be open source, but expanded versions may not be free. You can find a demo at the site with further descriptions.
These are products which must be purchased or licensed, or may have free access for normal users but commercial terms and conditions of usage.
Multiverse: MultiVerse (note: Multiverse claims to make their product available at no charge if they are not intended for non-commercial use.)
Olive: Forterra/OLIVE Brochure on Forterra Systems' web site - Now owned by SAIC http://www.virtualworldsnews.com/2010/02/forterra-sells-olive-to-saic.html