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Open Educational Resources: What Are They; Finding and Evaluating Them; Creating and Licensing Them: Hey, you found me!
Both a platform and a repository for open textbooks. Any registered user can contribute content. The author retains control over revisions to the module, and is attributed. Content is usually available in the form of modules, which can be selected and combined to create a custom textbook. Once you've adopted a module for your textbook, you can make edits to it in your textbook, but the module in the repository is still under its author's control.