GCompris - Educational Game for Children 2 to 10 years old.
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.
Tux Paint - Tux Paint is a free, award-winning drawing program for children ages 3 to 12 (for example, preschool and K-6).
Math Search - See posts, photos and more on Facebook.
Etoys - Etoys is an educational tool for teaching children powerful ideas in compelling ways.
Sum - Simple Maths Puzzle - How fast can you add two numbers?