NASA Exoplanet Posters - Imagine visiting worlds outside our solar system
SpaceVR - Explore space with Oculus Rift (pre-launch)
Spacetime - Work hour and time zone management for distributed teams.
Code NASA - 253 NASA open source software projects
Internet.org - The Internet... powered by planes, satellites and lasers.
Google Open Source - All of Googles open source projects under a single umbrella