Armagetron
Entertainment
Armagetron is a multiplayer game in 3d that attempts to emulate and expand on the lightcycle sequence from the movie Tron. It’s an old school arcade game slung into the 21st century.
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BZFlag
Entertainment
BZFlag is a multiplayer 3D tank battle for Irix, Linux, Solaris, or Windows.
Celestia
Entertainment
Unlike most planetarium software, Celestia doesn’t confine you to the surface of the Earth. You can travel throughout the solar system, to any of over 100,000 stars, or even beyond the galaxy.
ElectricSheep
Entertainment
Electric Sheep is a free, open source screen saver created by Scott Draves. It’s run by thousands of people all over the world, and can be installed on any ordinary PC or Mac.
Stellarium
Entertainment
Stellarium is a free open source planetarium for your computer. It shows a realistic sky in 3D, just like what you see with the naked eye, binoculars or a telescope. It is being used in planetarium projectors. Just set your coordinates and go.