dworksheets.com - Free K-12 math worksheets to assist students, teachers, parents & tutors to practice, teach or prepare grade school assignments, classwork or homework questions & answers is available online in printable & downloadable format.
GCompris - Educational Game for Children 2 to 10 years old.
NumberDrop - A uniquely challenging math puzzle game.
Tux Paint - Tux Paint is a free, award-winning drawing program for children ages 3 to 12 (for example, preschool and K-6).
Sum Fun - A fun number puzzle game for iPhone and iPad.
I Know It - "I Know It" is an online game for practicing primary-level math concepts.