Astronaut - You're an astronaut. Click to watch random videos in space.
NASA Exoplanet Posters - Imagine visiting worlds outside our solar system
SpaceX Falcon 9 Lander - Try (and fail) to land Elon Musk's SpaceX rocket
SpaceVR - Explore space with Oculus Rift (pre-launch)
Sky Guide - A window to the stars has never been more beautiful and easy to use.
Code NASA - 253 NASA open source software projects