I Know It - "I Know It" is an online game for practicing primary-level math concepts.
DragonBox Algebra - DragonBox Algebra 5+ - The educational game that secretly teaches you algebra.
Numbily - Free Math Game - Train your brain in a easy free math game! Improve your math skills!
Cool Math Endless Run - Cool Math Endless Run is a monster math game and an endless run adventure.
GCompris - Educational Game for Children 2 to 10 years old.
Akribian - Akribian turns children into Mathemagicians with their new iOS app, Count on me!