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Harmony of the Spheres

Gravitational n-body and space simulator written in JavaScript and WebGL

7 Alternatives To Harmony of the Spheres

Celestia

Celestia - real-time 3D visualization of space.

Cosmographia

This is an app that will let you explore the Solar System!

Digital Universe Atlas

Discover the universe with our downloadable atlas—the Digital Universe—where you can fly from the Sun out the edge of the observable universe.
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Orbiter

Orbiter is a realistic 3D real-time space flight simulator program. Official site with free download. DownloadDownload mirror 1 Europe - Textures - Gallery - Links - .

Pioneer Scout Plus

A game of missions, trade and space combat in the 31st century using the Pioneer Space Sim engine…
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Space Engine

Space Engine is a realistic virtual Universe you can explore on your computer.

Universe Sandbox

Universe Sandbox ² is a physics-based space simulator.