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Stellarium - Stellarium is a free open source planetarium for your computer.
Space Engine - Space Engine is a realistic virtual Universe you can explore on your computer.
SkyView - SkyView is powerful, easy-to-use app that answers questions about stars, constellations, and more.
Celestia - Real-time 3D visualization of space
Planetarium - A browser-based virtual planetarium of stars and planets, customizable to any location and time.
KStars - KStars is a Desktop Planetarium for KDE.