The following collections of open educational resources are searchable, oriented by discipline, and often provide reviews. Collections in bold are recommended. The list is broken up into two categories: OERs from a single platform or collection and OER repositories. OER publishers and collections focus on open textbooks that sometimes include supplemental materials, whereas OER repositories can include open textbooks, courses, lesson plans, and more. Please note that this list is not extensive.
When exploring OER options, it is important to investigate across different repositories and collections. Each one contains different books and resources.