reddit shell - Web-based shell for browsing reddit (pretend you're working)
Space Engine - Space Engine is a realistic virtual Universe you can explore on your computer.
University of Reddit - Learn 1,000's of new things, from reddit
Celestia - Real-time 3D visualization of space
Reddit App - The official app for Android & iOS. Meow.
Stellarium - Stellarium is a free open source planetarium for your computer.