SpaceX Falcon 9 Lander - Try (and fail) to land Elon Musk's SpaceX rocket
Stellarium - Stellarium is a free open source planetarium for your computer.
Universal Paperclips - Make paperclips not war
Sky Guide - A window to the stars has never been more beautiful and easy to use.
Astronaut - You're an astronaut. Click to watch random videos in space.
SkyView - SkyView is powerful, easy-to-use app that answers questions about stars, constellations, and more.