GCompris - Educational Game for Children 2 to 10 years old.
globalquiz.org - Difficult, multiplayer and multi-language trivia game.
Tux Paint - Tux Paint is a free, award-winning drawing program for children ages 3 to 12 (for example, preschool and K-6).
HugeQuiz - test your knowledge with a variety of quizzes about everything.
I Know It - "I Know It" is an online game for practicing primary-level math concepts.
JetPunk - JetPunk is the biggest online quiz platform that contains sports, geography, music, movies, and more regional or international information and database, created by H Brothers Inc.