Toon Doo is a free open application that allows anyone to create a comic strip. All it takes to sign up is a username and password.
At ToonDoo you can create your own strip cartoons and, using a collection of strip cartoons, turn them into cartoon books. To get started, you simply choose a single, double, or triple panel. You can import images, but Toondoo offers a wide range of characters, text bubbles, backgrounds, etc.
Toon Doo can be used in any classroom at any level and it is easy for students and teachers to create.