I came across the Open Source Gift Guide, where I found a number of interesting things, including an Open Source Planetarium called Stellarium. It run on Windows, Mac and Linux.
Stellarium is free GPL software which renders realistic skies in real time with openGL. With Stellarium, you really see what you can see with your eyes, binoculars or a small telescope. Stellarium is also used in planetariums.
The developers have set up a Wiki that includes documentation etc.
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