MatchUp - The best place to find more of the sports you love to play.
Train Fitness - Automatically track your workout at the gym - hands free!
Fitrockr - Compete in social fitness leagues
MoovBuddy - An exercise app for back & neck pain and joint health
BurnAlong - Exercise online with whoever motivates you
Dualnback.works - Dual N-back is a specific brain training exercise, that's been shown by research - it might improve fluid intelligence.