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.
Treat - Improve your diet and fight back against disease
MyTrails - Offline trail maps for Android (and online too!)
The Scientific Meal Planner - Free meal plans optimally balanced for health and longevity
RunnerUp - RunnerUp - A open source run tracker inspired by Garmin 410, ...
Common Killer - Find a drug free way to get rid of headache