Stellarium (opens in new tab)

Stellarium renders 3D photo-realistic skies in real time with OpenGL. It displays stars, constellations, planets and nebulae, and has many other features including multiple panoramic landscapes, fog, light pollution simulation and a built-in scripting engine. Stellarium comes with a star catalogue of about 600 thousand stars and it is possible to download extra catalogues with up to 220 million stars. Stellarium has multiple sky cultures - see the constellations from the traditions of Polynes...