Crimild Engine is an open source scene graph based engine which purpose is to fulfil the high-performance requirements of typical multi-platform two and tridimensional multimedia projects, like games, simulations and virtual reality.
HyperInteractiveReality[hir] is virtual reality evolved. HiR is a system that allows anyone to do anything. HiR is the interactive representation of ideas via sound, graphics and immersive worlds. A power toolbox for artists and scientists alike. -- more to come soonly!
VRMoo can be summed up as such: Virtual Reality Object Oriented MUD. I intend VRMoo to be capable of simulating complex environments, allowing real time 3D interaction with these environments, and allowing real time 3D interaction with other users.
The VROnline project is universal 3D virtual reality engine for games with client/server architecture, free 3D camera, user configurable actions and AI scripts. It's based on C# and directX (now 9.0) technology. It can manage many data models(rpg,sims).