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Stellarium - Stellarium is a free open source planetarium for your computer.
Celestia - Real-time 3D visualization of space
Mitaka - Mitaka is software for visualizing the known Universe with up-to-date observational data and...
Satscape - A satellite tracking program for Windows, Mac OS and Linux.
WorldWide Telescope - The WorldWide Telescope (WWT) is a Web 2.
Heavens Above - Website for tracking Satellites, Space ships and other space objects.