Celestia is a free 3D astronomy program. Based on the Hipparcos Catalogue, it allows users to display objects ranging in scale from artificial satellites to entire galaxies in three dimensions using OpenGL. Unlike most planetarium software, the user is free to travel about the Universe.


CannonSmash is a funny 3D table tennis game. It takes a while to get your hand at ease with the mouse+keyboard manipulations. But once you're used to the technique, you can feel like playing a real game. It is playable against the computer or through a network.


ACM is an air combat simulator. This version is implemented as a distributed simulation. It communicates information via the IEEE Distributed Interactive Simulation protocol.