HoDoKu - HoDoKu is a sudoku helper written in Java and available in English and German.
NumberDrop - A uniquely challenging math puzzle game.
Yasminoku - Sudoku game and solver totally written in DHTML.
Math Master - Brain Quizzes - Math Master is a free math quiz game designed for all ages!
Simple Sudoku - Freeware Sudoku Puzzle Maker and Solver
Math Search - See posts, photos and more on Facebook.