INTERACTIVE

Incredibox http://www.incredibox.com/en/#/application
Pointer Pointer http://pointerpointer.com
Circle the CatFill in circles on a grid to trap a cat.
Interactive dogCommands: sit, roll over, down, stand, sing, dance, shake, fetch, play dead, kiss

Cool Math Simulations http://phet.colorado.edu/en/simulations/category/math

Cool Math Games http://www.coolmath-games.com/
Math Dork Games http://www.mathdork.com/mathgames.html
Lemonade Stand

OPTICAL

Doodling in Math http://vihart.com/doodling/
Optical Illusions http://www.personal.kent.edu/~rmuhamma/OpticalIllusion/illusion.html


INFORMATIVE

Computational Knowledge Engine http://www.wolframalpha.com/
Ask Dr. Math