Stellarium
Category: Math and Science
Software homepage: http://www.stellarium.org/
(21 votes, average: 3.95 out of 5)Stellarium is a free open source planetarium for your computer. It shows a realistic sky in 3D, just like what you see with the naked eye, binoculars or a telescope.
It is being used in planetarium projectors. Just set your coordinates and go.