Math Games - Math Games is a website which kids in Preschool through 8th grade can practice math.
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.
Yasminoku - Sudoku game and solver totally written in DHTML.
GCompris - Educational Game for Children 2 to 10 years old.
nsudoku - A Sudoku game made with ncurses.