Solar Kingdom (Popularity: )
http://www.silverfrost.com [commercial, demo available - Win95/98/NT] A solar system simulator and planetarium, with planetary encyclopaedia.
OpenUniverse (Popularity: )
http://www.openuniverse.org [open source - Win95/98/NT/2000 or Unix/Linux & OpenGL] Newest NASA data creates a fast 3D display of our home solar ...
Starry Night (Popularity: )
http://www.starrynight.com [commercial - Win95/98/NT, Macintosh] A planetarium and solar-system simulator; lets you view the universe from anywhere in our planetary neighbourhood ...