Sketch This - Daily drawing challenges
MathIsFun Times Table - Learn Your Multiplication Tables
ChalkMotion - Create animated doodle slideshows
I Know It - "I Know It" is an online game for practicing primary-level math concepts.
Cycloid Drawing Machine - A mesmerising spirograph-like web app
childsplay - Childsplay is a collection of educational activities for young children and runs on Windows, OSX, and Linux. Childsplay can be used at home, kindergartens and pre-schools.