HoDoKu - HoDoKu is a sudoku helper written in Java and available in English and German.
Cool Math Endless Run - Cool Math Endless Run is a monster math game and an endless run adventure.
Simple Sudoku - Freeware Sudoku Puzzle Maker and Solver
Akribian - Akribian turns children into Mathemagicians with their new iOS app, Count on me!
nsudoku - A Sudoku game made with ncurses.
MathIsFun Times Table - Learn Your Multiplication Tables