Although I find it very generous and helpful, I often wonder how some guys like Patrick Chevalley and others can spend enormous time on fantastic programs, then give them away!
Quote:
I quote on Cartes du Ciel creator: "According to the programmer, Patrick Chevalley, it was released as freeware because "I’d rather see amateurs spend their money for a new eyepiece than for astronomy software". Patrick has also created a lunar atlas program, Virtual Moon Atlas, which is also free software".
http://en.wikipedia.org/wiki/Cartes_du_Ciel
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Ricci from Italy (also a programmer who gives his programs for free) has posted a thread in here and other Astro Forums containing hundreds of totally FREE Astronomy software programs.