MathIsFun Times Table - Learn Your Multiplication Tables
Wikids - An encyclopedia that talks to your kids
DragonBox Algebra - DragonBox Algebra 5+ - The educational game that secretly teaches you algebra.
Numito - Word and number puzzles game, similar to Countdown GameShow
Cool Math Endless Run - Cool Math Endless Run is a monster math game and an endless run adventure.
Cotrio - The most beautiful way to move your brain and imagination