Edusim is a free opensource 3D multi-user virtual world specifically for your classroom
interactive whiteboard (Smartboard, Activeboard, Interwriter, Mimio, eBeam, or WiiBoard).
Edusim is extendable allowing multiple classrooms to connect their interactive whiteboards
for collaborative learning session. Read more about Edusim and turning your classroom interactive
whiteboard into a low cost single walled CAVE based virtual world platform here.