Space Engine - Space Engine is a realistic virtual Universe you can explore on your computer.

Cast Your Vote - Cast Your Vote is an app that allows you to set polls and a voting system and know the answer to your question.

Celestia - Real-time 3D visualization of space

My Vote - My vote is an app that allows you to create ranking, ratings, polling contests, and view the results either after voting closes or in real-time.

Stellarium - Stellarium is a free open source planetarium for your computer.

Right2Vote - Right2Vote is an e-voting app that lets you create and manage polls or election campaigns.