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.
What's new in this version:
Version 0.12.2 includes variable stars, re-packed star catalogs (Hipparcos and Tycho-2), improvements for plugins, and scripting engine and search tool.