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Celestia is an OpenGL-based 3D space simulation for Unix and Win32 that lets you travel through the solar system, to the stars, and even beyond the galaxy. Visit over 100,000 stars, 100 solar system bodies, and all known extrasolar planets.
KStars is a graphical desktop planetarium for KDE. It provides an accurate simulation of the night sky, as seen from any location on Earth, on any date. It has a host of tools for every astronomer and astronomy enthusiast!
Aciqra (uh-SEE-kruh) is a free and open source virtual planetarium and sky mapping program which tracks celestial bodies including planets, deep sky objects and stars to an accuracy of a fraction of a degree for thousands of years into both the future and the past.
Nightshade is free, open source astronomy simulation and visualization software for teaching and exploring astronomy, Earth science, and related topics. Nightshade is a fork of the award-winning Stellarium software, but tailored for planetarium and educator use. The emphasis is on usability ... [More]