http://aberrator.astronomy.net/ Freeware star test "simulator"
http://ascom-standards.org/ The free telescope driver system
Observing planning and logging for both Apple and Windows users
Cartes du Ciel
Sky Charts, amateur astronomy's favorite freeware planetarium software Deepsky
Observing planning and logging; also includes extensive charting and image-processing features
Earth Centered Universe http://www.nova-astro.com/ Inexpensive planetarium/atlas software
Freeware telescope control program/driver for Synta GEM mounts
http://www.pk3.org/Astro/ Webcam control and image processing
Keith's Astroimager and Keith's Image Stacker http://www.cs.unm.edu/~kwiley/software.html
Free webcam control and image stacking software for Macintosh users Megastar
http://www.willbell.com/software/megastar/index.htm The computer star atlas
http://astrogeeks.com/Bliss/MetaGuide/index.html Webcam-based autoguiding and automated collimation
http://www.celestron.com/c2/technology_view.php?TechnologyID=3 Virtual hand control for Celestron NexStar telescopes
A simple but clever program that makes polar alignment with a borescope easy Registax http ://www.astronomie .be/registax/
The premier image stacking program for Windows users
Innovative observing, planning, and logging program with many charting features Starry Night
The prettiest of the "pretty planetariums" software programs
Advanced planetarium program/telescope control system; currently in Version 6 but soon appearing in a new version
Virtual Moon Atlas
Detailed lunar mapping program with many utilities for Moon observers; freeware
Full-featured planetarium software for Apple and Windows users
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