The software homepage to have the last updates
http://www.geocities.com/SiliconValley/Code/7659/
Write to softwares autors :
Guillaume Richard,
Laurent Saint-Marcel
astrosoftware@geocities.com
To know if some artificial satellites are visible :
http://www.gsoc.dlr.de/satvis/
The Astro-club of the Ecole Nationale Supérieure des Mines de Saint-Etienne :
http://messel.emse.fr/~astro
XEphem page, one of the best astronomical software for UNIX and LINUX :
http://www.ClearSkyInstitute.com
A great sky calendar
http://jpl.nasa.gov/calendar
Everything you want to know about planets
http://pds.jpl.nasa.gov/planets
Anglo Australian Observatory :
http://www.aao.gov.au/images.html