This is a child friendly version of go animate which is moderated and therefore perfect for kids. I have also been updating my own website with over 300 free web tools reviewed and linked. If you haven't been for a while it could well be worth a visit. http://web2educationuk.wetpaint.com
The Kerpoof Studio website is owned and operated by the Walt Disney Company and true to form is super fun. According to this cool, free teacher resource, educators and students can discover things while being creative in the following ways:
Make artwork (even if you aren't good at drawing!)
Make an animated movie (really! it's easy!)
Earn Koins which you can trade for fun things in the Kerpoof Store
Make a printed card, t-shirt, or mug
Tell a story
Make a drawing
Vote on the movies, stories, and drawings that other people have made