Space Engine - Space Engine is a realistic virtual Universe you can explore on your computer.
Orbital - Orbital is an Arcade, Puzzle and Single-player video game created by Bitforge Ltd.
Celestia - Real-time 3D visualization of space
ZipMessage - ZipMessage replaces live meetings with asynchronous conversations.
Stellarium - Stellarium is a free open source planetarium for your computer.
Noor - Chat like you're in the office together