Mars Colonies - A free old-school RTS... on Mars
SpaceVR - Explore space with Oculus Rift (pre-launch)
HACKTIKA - Fill your Growth Idea Backlog by the Best Growth Hackers
Astronaut - You're an astronaut. Click to watch random videos in space.
OpenMCT by NASA - A web based mission control framework
NASA Exoplanet Posters - Imagine visiting worlds outside our solar system