GURPS Space Worldbooks=>http://www.sjgames.com/gurps/books/space_books.html 
 3-D Starmaps=>http://www.clark.net/pub/nyrath/starmap.html 
 The Nine Planets=>http://www.seds.org/billa/tnp/ 
 Science Fiction Resource Guide=>http://sflovers.rutgers.edu/Web/SFRG/ 
 Space FAQ (sci.astro.* and sci.space.*)=>http://www.lib.ox.ac.uk/internet/news/faq/sci.space.science.html
 ChView Starmapping Utility=>http://members.nova.org/~sol/chview/
 Alien Planet Designer=>http://www.cix.co.uk/~vicarage/planets/index.html
 Solar System Generator=>http://home.attbi.com/~brons/NerdCorner/StarGen/StarGen.html