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OpenSpace - OpenSpace is open source interactive data visualization software designed to visualize the entire known universe and portray our ongoing efforts to investigate the cosmos.
Stellarium - Stellarium is a free open source planetarium for your computer.
Celestia - Real-time 3D visualization of space
Space Engine - Space Engine is a realistic virtual Universe you can explore on your computer.
WorldWide Telescope - The WorldWide Telescope (WWT) is a Web 2.
Hacker News Search - a faster hnsearch