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.
Celestia - Real-time 3D visualization of space
Sky Guide - A window to the stars has never been more beautiful and easy to use.
WorldWide Telescope - The WorldWide Telescope (WWT) is a Web 2.
Stellarium - Stellarium is a free open source planetarium for your computer.
Space Engine - Space Engine is a realistic virtual Universe you can explore on your computer.