Flow Free - Big Duck Games is an indie mobile game studio, focused on creating quality casual games, and especially puzzle games.
Next! Fitness - A.I. powered gym
Board Defenders - Puzzel games based on the chess rules
Dualnback.works - Dual N-back is a specific brain training exercise, that's been shown by research - it might improve fluid intelligence.
LeveLisa - The brain game that creates creativity
PopcornTime iOS App - Watch movies & TV shows instantly on iOS (no jailbreak req.)