Storybird is a book creation web app that can be used on tablets as well as computers. Artists provide art to inspire writing. Once logged in, users drag and drop artwork into a book format and start typing. It provides a simple spell check service which is built in to the site. It has recently been upgraded to allow not just picture book creation, but magnetic poetry and novelisations as well. It features writing challenges and is set up for anyone to use to write.
Educators can set up accounts for children, or children can set up their own (with parent permission). The site itself is free to use, however the site owners own the copyright on all books created. It is sustained by a range of options to turn your digital text into print form.