Finding open educational resources can be a complicated process. Open educational resources can be found everywhere and anywhere and have no unified form of evaluation before they are made available to the public. However, one of the best ways to find high quality open educational resources is Open Educational Resource Repositories (OERRs).
An Open Educational Resource Repository is an online storage system that allows educators to share, manage, and use educational resources. Repositories can contain a collection of learning items that support instruction, including:
Below you will find a list of Open Educational Resource Repositories that are a good place to start your search. This list is not exhaustive, but these large repositories have a good breadth of disciplines, subjects, and formats. Lists of repositories that are material-specific and subject-specific are also available.
The Mason OER Metafinder searches across 21 different sources of open educational materials. It searches well-known OER repositories like OpenStax, OER Commons, MERLOT but also sites like HathiTrust, DPLA, Internet Archive and NYPL Digital Collections where valuable but often overlooked open educational materials may be found.
The MERLOT collection consists of tens of thousands of discipline-specific learning materials, learning exercises, and Content Builder webpages, together with associated comments, and bookmark collections. These materials have been contributed by the MERLOT member community who have either authored the materials or who have shared existing open education materials. Materials in MERLOT are reviewed for suitability for retention in the collection. Many undergo the more extensive "peer review" for which MERLOT is known. MERLOT has also added a "Smart Search" function which searches for OER at other libraries/repositories, and which can also search the web using a proprietary MERLOT user profile design to find the newest and most popular learning materials available.
Openly Available Sources Integrated Search (OASIS) is a search tool that aims to make the discovery of open content easier. OASIS currently searches open content from 98 different sources and contains 368,237 records.
OER Commons offers a comprehensive infrastructure for curriculum experts and instructors at all levels to identify high-quality OER and collaborate around their adaptation, evaluation, and use to address the needs of teachers and learners.