"Zimmer Twins is a fun site for digital storytelling that looks like a cartoon. What makes ZT so great is that it can be used in education and is fairly safe. The reason I say "fairly" is because there is no true filtering going on. However, they do have strict usage policy which they enforce so nothing inappropriate gets posted (they have a flagging policy)"
Storybook is a free (open source) novel-writing tool for creative writers, novelists and authors which will help you to keep an overview of multiple plot-lines while writing books, novels or other written works.
Storybirds are short, visual stories that you make with family and friends to share and (soon) print.