- space-track.org official TLE data from the air-force excluding “secret satellites”
- Mike McCants' classified TLEs
- heavens-above.com forecasts of iridium flares, ISS passes for your location (and more)
- N2YO real time satellite tracking
- Union for Concerned Scientists Satellite Database
- United Nations Office for Outer Space Affairs
- KMZ für Google Earth mit Real-Time Satelliten Informationen
- www.satobs.org Ressource for visual satellite observeration and the See-Sat mailinglist
- www.hearsat.org Ressource for satellite radio signal monitoring and the Hearsat mailinglist