Always remember to check the licenses and terms of use of resources that you include in your courses. Many OER web sites and repositories also include contents or links to content that is free for educational use but not openly licensed.
Use the links below to find OER and ZTC materials, including individual assignments, assessments, textbooks, and entire courses. Be sure to confirm the licensing terms of any material you use, as some sites link to materials that are not open access or in the public domain.
OER repositories contain more than just open textbooks. All content featured within these pages is free but usage rights vary. Materials in these repositories are released under a Creative Commons license while some are in the public domain.
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.