There are a multitude of OER out there to choose from, including textbooks, courses, multimedia, data, and supplementary materials. These can be found by searching regular search engines (like Google) and using certain keywords, but it is much easier to find them through dedicated OER repositories or websites. Down below, you will find links to different repositories and databases that house Open Ed materials.
The materials contained in the "Where to Find OER Material" tab are adapted in part from Adoption Guide - 2nd Edition by BCcampus and licensed under a Creative Commons Attribution 4.0 International License
Using Google Advanced Search
The Google search engine has an “Advanced Search” that lets you search by usage rights for content published to the Internet under an open license. The Advanced Search dialogue can be found under the Settings function or can be directly accessed at http://www.google.com/advanced_search
You can pair CC keywords, Boolean operators, and discipline-specific terms to yield results: