Finding the right content for an Open Educational Resource (OER) can be the most challenging part of using and creating OERs. The resources listed on this page can help you find OER in your subject area which you can choose to adopt completely or mix, match, and customize to create a customized resource for your students.
Open textbooks are free, online learning materials with Creative Commons licenses. Many of the collections will have links to the same books, but each will have a particular focus, and items you can't find in other collections.
Everything published by the Federal government is free of any copyright restrictions. The research, reports and websites can be useful resources for classes when creating your own course material.
Try to search a specific agency's website. A-Z List of Federal Agencies. Many times these materials are not retrieved with simple Google searches. Here are some examples of US Federal Databases.