Existing Efforts, Systems, and Applications
DIVE (Swedish Institute of Computer Science)
NICE / Limbo / CAVERNUS (Electronic Veisualization Lab)
RAVEL (Drew Kessler @ U. Penn)
SPLINE (Mitsubishi Electric Reseach Laboratory)
DAFFIE (SCV)
CCC (Virginia Tech)
Active Worlds
MEME (Immersive Systems)