Go! Animate - create animated videos for free

"Go! Animate is a site that allows you to create animated videos, for free. There is also a school account that is private and secure, has school safe content, content moderation and group management, starting at $8 per month."

http://educationaltechnologyguy.blogspot.com/2012/03/go-animate-create-animated-videos-for.html

http://goanimate.com/