Interreality/3D is the effort within the Interreality project to apply VOS to multiuser shared 3D virtual environments. The main client codebase has an internal codename of TerAngreal. Most of TerAngreal's 3D rendering of VOS objects is performed, however, by a plugin to the CrystalSpace 3D graphics engine, and this plugin may be reused in other applications. The set of Vobject types for describing 3D worlds is A3DL.
See also http://interreality.org/projects/vr for more.