AlltheInterweb's Internet Directory
Astronomy & Space >
Distant Suns - First created in 1985 for the Amiga, has since gone on to become available for Windows (retired), Mac (retired), and now the iPHONE.
Stellarium - Free, easy to use, Open Source planetarium software that shows exactly what you see when you look up at the stars.
STARRY NIGHT - The World's most realistic Astronomy Software.