Eduism is an Open Source software in Alpha testing - http://edusim3d.com/

 

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Edusim is a free opensource 3D virtual world specifically for your classroom interactive whiteboard! Edusim is an extremely powerful way to engage your students by bringing a 3D virtual environment that allows the direct manipulation of the 3D virtual learning objects directly from the interactive whiteboard surface. The Edusim is extendable allowing multiple classrooms to connect their interactive whiteboards for collaborative learning session!