http://goanimate.com/ 

About the site -

We are a bunch of guys who love animation and want to share our passion with the world! The problem is that animation requires very specific skills. Animators need to learn Flash or other advanced software before being able to create anything. They also need to know how to draw. That’s why we created GoAnimate, a platform that allows people to express themselves through animation without having to learn to draw or install any software.