Star Chart - Stellarium is a planetarium software that shows exactly what you see when you look up at the stars. It's easy to use, and free. Read more about Star Chart.
Sky Map - Sky Map (formerly the Google Sky Map) turns your Android-powered mobile phone into a window on the...
Google Sky Map - Google Sky Map is a free hand-held planetarium that allows you to identify stars, planets and more.
Star Walk - Star Walk – Sky View: Explore the Stars.
Code NASA - 253 NASA open source software projects
Stellarium - Stellarium is a free open source planetarium for your computer.