Open Educational Resources or OERs (including open textbooks) are any content which is:
- openly available (can be readily found or discovered)
openly accessible (exists in a form which others can readily use)
- openly reusable (faculty can easily modify & license allows)
For links to major collections, subject collections, open courses, textbooks, and more, see NWTC's Open Educational Resources Guide.
A great place to search for Open Educational Resources is through the Creative Commons site.
See Spokane Community College's guide to open textbooks and other open educational resources.