These search engines are a great place to start your OER search, especially if you're not tied to textbooks. They search a variety of OER collections, databases, and repositories to make your search a bit easier.
Provides a centralized search of open content from 84 different sources. Created by SUNY Geneseo's Milne Library.
Provides a simultaneous search across 20 different sources of open educational materials. Created by George Mason University.
The Open Textbook Library is the best one-stop site for locating open textbooks. The library includes textbook reviews from faculty across the nation.
OpenStax has a selection of open textbooks aimed towards large enrollment courses, and in addition to free online texts, also offers low cost print copies that can be ordered online or through campus bookstores. OpenStax also has an OER Commons community hub, where instructors can share ancillary resources developed for OpenStax textbooks.
BCcampus Open Education offers a collection of hundreds of open textbooks created by faculty at academic institutions in British Columbia.
OER Commons is a repository of over 50,000 OER of all types, and its “Open Author” platform can be used to create new resources.
Teaching Commons brings together OER that have been curated by librarians at colleges and universities throughout the US.
MERLOT is a collection thousands of free and openly licensed resources with 20 different material types, including assignments, case studies, textbooks, quizzes, and more.