Macros - Macros – Calorie Counter and Meal Planner created and published by JosmanTek for Android and iOS devices.
SpaceX Falcon 9 Lander - Try (and fail) to land Elon Musk's SpaceX rocket
Human:Activity tracker - Activity tracker - Walking, running, biking and Calorie tracking
SpaceVR - Explore space with Oculus Rift (pre-launch)
Runtastic - Runtastic offers a series of fitness apps that can be used to track your running, walking, hiking, and cycling, as well as many other fitness routines. Read more about Runtastic.
The Size of Space - An interactive visualization of the universe