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.
The Stellarium team is proud to announce the release of version 0.9.1. This is primarily a bug fix and stabilization release. Apart from bug fixes, users can expect to see improved start-up times and a new sky culture (Tupi-Guarani) as well as some progress with translations and overall stability.
Tools and Utilities
Product page: here