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Space Engine - Space Engine is a realistic virtual Universe you can explore on your computer.
SmallDevTools - Handy developer tools with a delightful interface
Stellarium - Stellarium is a free open source planetarium for your computer.
whatdevsneed - This is whatdevsneed.
Celestia - Real-time 3D visualization of space
Google Open Source - All of Googles open source projects under a single umbrella