Stellarium is a free open source planetarium for at software 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.
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A shooting star flashes past the Jupiter. You can select different intensities in the View window. Press N to bring up the nebula labels. The dance of the planets above ESO headquarters, near Munich.
Full sky view of the constellations, their boundaries, the Milky Way. Click on the picture to the left for details. 3D graphics card which supports OpenGL 3. The latest development snapshot of Stellarium is kept on github. If you want to compile development versions of Stellarium, this is the place to get the source code. IRC channel on the freenode IRC network. Use your favorite IRC client to connect to chat.