Online teaching, learning, and faculty development services contributed and used by an international education community. Includes open textbooks. The Material Type and Audience limiters in Advanced Search are particularly helpful.
An independent search engine that indexes open education courses from members of the Open Education Consortium. Note that this search includes resources from Merlot (listed above) but has less advanced search functionality.
Courses originally developed by the company Boundless, and currently maintained by Lumen Learning. Includes texts broken into chapters and modules, so that part or a whole chapter or book can be incorporated into a course.