Pressbooks - Create books: print and ebooks
Marionette Studio - Marionette Studio is an online animation software for beginners and professionals. Animate 2D characters and environments in minutes with no prior skills.
Papermine - Create stunning digital booklets.
Jitter - A simple animation tool on the web
Mockupea - Mockupea is an online tool for creating 3d book mockups with a lot of features.
Spirit - The animation tool for the web.