I Know It - "I Know It" is an online game for practicing primary-level math concepts.
MathIsFun Times Table - Learn Your Multiplication Tables
Numbily - Free Math Game - Train your brain in a easy free math game! Improve your math skills!
GCompris - Educational Game for Children 2 to 10 years old.
NumberDrop - A uniquely challenging math puzzle game.
Akribian - Akribian turns children into Mathemagicians with their new iOS app, Count on me!