Star Chart - Stellarium is a planetarium software that shows exactly what you see when you look up at the stars. It's easy to use, and free. Read more about Star Chart.
SpaceX Falcon 9 Lander - Try (and fail) to land Elon Musk's SpaceX rocket
Google Sky Map - Google Sky Map is a free hand-held planetarium that allows you to identify stars, planets and more.
SpaceVR - Explore space with Oculus Rift (pre-launch)
Code NASA - 253 NASA open source software projects
Coinbase Asset Management - Index funds, but for cryptocurrencies 💸