6 links
Heavens Above
heavens-above.com
Online program that include graphics generated in real-time and customized for a location and time zone to observe satellites such as ISS, space shuttle, and iridium flares.
NORAD Two-Line Element Sets
celestrak.com
Orbital data for any satellite tracking program, updated regularly by CelesTrak.
Northern Lights Software Associates
nlsa.com
A windows-based program with real time tracking of an unlimited number of satellites.
Software and Data from David H. Ransom, Jr.
dransom.com
Various software downloads, orbital data downloads, images, and links.
TrackingSat
geocities.com
Program useful to assist satellite professionals, operators and domestic users that need to install an antenna and align it with the satellites in orbit.