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.
SkyView - SkyView is powerful, easy-to-use app that answers questions about stars, constellations, and more.
Google Sky Map - Google Sky Map is a free hand-held planetarium that allows you to identify stars, planets and more.
Sky Map - Sky Map (formerly the Google Sky Map) turns your Android-powered mobile phone into a window on the...
Code NASA - 253 NASA open source software projects
Star Walk 2 Free - Star Walk 2 Free is a sumptuous planetary application that is turning out to be a great tool in identifying the objects in the night sky.