Heavens Above
Heavens Above
http://www.heavens-above.com/
Google Earth
Google Earth
http://earth.google.com/
Celestia
Celestia, a real-time 3d space simulation featuring a database of over 100,000 stars, nearly a hundred solar system, objects, and a complete catalog of extrasolar planets.
http://www.shatters.net/celestia/
NASA Free Software
NASA Free Software
http://www.grc.nasa.gov/www/k-12/freesoftware_page.htm
NASA Open Source Software
Nasa ames open source software
http://opensource.arc.nasa.gov/
Orbiter
Orbiter is a free 3d space flight simulator using real physics
http://orbit.medphys.ucl.ac.uk/
Nasa World Wind
Nasa World Wind
http://worldwind.arc.nasa.gov/
WinOrbit
WinOrbit
http://www.sat-net.com/winorbit/