OER are teaching, learning, and research resources that reside in the public domain or have been released under an intellectual property license that permits their free use and re-purposing by others. ~ William & Flora Hewlett Foundation
For a more comprehensive overview on OER, see Open Educational Resources - a guide designed to assist faculty in the exploration, identification, selection and adoption of Open Educational Resources.
This is a small sampling of OER resources that is available for Psychology. Additional OER and more information for the subject area may be found by referring to the Open Educational Resources Guide provided by ACC Library Services.