I was reminded this week what a good resource Super Action Comic Maker from Artisan Cam is. We also discussed Myths and Legends from E2BN. In addition, from Read Write and Think comes the Comic Creator:
The Comic Creator invites students to compose their own comic strips for a variety of contexts. This focuses on the key elements of comic strips by allowing students to choose backgrounds, characters, and props, as well as to compose related dialogue. The tool is easy to use, made even easier with the Comic Strip Planning Sheet, a printable PDF that comic creators can use to draft and revise their work before creating and printing their final comics.