Provides information on all facets of visual observation.
http://www.satobs.org/
Satellite tracking and decoding software, including WXtrack, WXtrackGL, SatSignal, GeoSatSignal, and the HRPT Reader is available for download.
http://www.david-taylor.myby.co.uk/software/wxsat.htm
Software for PalmPilot with documentation, FAQ, data, trial download, and links.
http://www.bigfattail.com/pocketsat/
A tabular guide to amateur radio satellite frequencies.
http://www.n1rwy.com/satellite/freqguide.html
Links to extensive list of programs for IBM, Macintosh, Unix, Amiga, and Archimedes systems.
http://www.satobs.org/orbsoft.html
Personal notes from an enthusiast, images, and radio frequencies and voice.
http://home.earthlink.net/~w0dfi/2nd.html
Hardware/software products to receive data from weather satellites, for the amateur radio enthusiast
http://www.time-step.com/
Real-time satellite, ISS, and Space Shuttle orbital pass information, maps, star and charts.
http://www.heavens-above.com/