Universe Sandbox

Universe Sandbox ² is a physics-based space simulator.

13 Alternatives To Universe Sandbox

Celestia

Celestia - real-time 3D visualization of space.

Cosmographia

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

Cosmonium is a 3D astronomy and space exploration program.

Elite Dangerous

Elite Dangerous is a 2015 Trading, Action, Sci-fi, Exploration, Open World and Space Simulation by Frontier Developments.

Enter the Gungeon

Enter the Gungeon is a gunfight dungeon crawler following a band of misfits seeking to shoot, loot, dodge roll and table-flip their way to personal absolution by reaching the legendary Gungeon’s ultimate treasure: the gun that can kill the past.

Homeworld

Homeworld is an Action-Adventure, Science-fiction, Real-time Strategy, Real-time-tactical, Single and Multiplayer Space Simulation created by Relic Entertainment and published by Sierra Entertainment.
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Kerbal Space Program

Build spacecraft, fly them, and try to help the Kerbals to fulfill their ultimate mission of conquering space.
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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 - .

Sky Map

Sky Map (formerly the Google Sky Map) turns your Android-powered mobile phone into a window on the…
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Space Engine

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

Star Conflict is a free MMO action game and space simulator that was introduced in 2012.

Stellarium

Stellarium is a free open source planetarium for your computer.
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Vendetta Online

The space-based MMO Vendetta Online balances an online trading system with tense ship-to=ship combat.