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Open Educational Resources Guide: Guides, Repositories & Collections

A Leeward Faculty guide to OER

OER Search

Search: Mason OER Metafinder

The George Mason University OER Metafinder allows you to search up to 15 open repositories at the same time.

Please note that this tool searches OER repositories such as OpenStax and Open Textbook Library as well as digital archives such as American Memory (LOC) and Project Gutenberg. The default is to search all repositories, but you can select specific ones to limit your search to course-specific materials. 

Repositories and Collections

Digital repositories and referatories will aid in your discovery of open education resources. Search for textbooks, modules, learning objects, videos, and more.


Images, videos, documents, and audio files from public institutional collections. When doing a search, freely available items are labeled as "PUBLIC." Terms and Conditions for non-commercial educational use information.

The Cleveland Museum of Art
The Cleveland Museum of Art announced on January 23, 2019, that it is an Open Access institution, using the Creative Commons Zero (CC0) designation mark for high-resolution images and data as related to its art collection. Open Access means the public now has the ability to share, collaborate, remix, and reuse public domain images from the CMA's world-renowned collection. Select "Open Access" under the search fields to filter for CC0 works.

Digital Public Library of America
Portal to millions of digitized images, documents, and primary source materials from America's archives, libraries, and museums. After using the search box, refine your search using the "How Can I Use It?" for usage rights options. "Unlimited Re-Use" refers to works believed to be in the public domain (in the U.S.).

Flickr Advanced Search
This photo repository offers an Advanced search with an "Any license" menu drop to select preferred usage rights including Creative Commons licenses and no known copyright restrictions (public domain).

Flickr Commons
Numerous participating institutions share images from the world's public photography archives. Usage Rights Statement.

The Gender Spectrum Collection
Contains a stock photo library featuring CC BY-NC-ND 4.0 licensed images of trans and non-binary models.

Google Images
Use Google's Advanced Image Search to limit the usage rights with the menu option "Creative Commons licenses."

The Metropolitan Museum of Art
In February 2017, the Met introduced its Open Access Initiative which makes all images of public domain artworks and basic data on all accessioned works in its collection available for unrestricted use. Use "Show Only: Open Access" when doing a search to identify works in the public domain. These will have the "OA" symbol. 

These CC0 images are in the public domain. Free to use, edit, and modify for personal and commercial uses.

Open Content Program - Getty Museum
Digital images to which the J. Paul Getty Museum holds the rights or that are in the public domain. (No copyright in the United States.) When using the Getty Search Gateway to look for images, make sure the "Open Content Images" filter is selected.

Formerly CC (Creative Commons) Search, this search engine includes visual and audio resources with CC licenses or are in the public domain. Use the filter tool to search by CC license preference.

All clipart in Openclipart is in the public domain. Images can be downloaded in various sizes and formats.

Pixabay is a database of more than 2.6 million photos, illustrations, vector graphics and videos released with the Pixabay open license and no required attribution. 

Free high-resolution images gifted by the global community of photographers for commercial and noncommercial use. Utilizes the Unsplash open license. Attribution is a courtesy.

This is an online resource for visual arts that includes a collection of over 140,000 images available for non-commercial educational and research use (copyright notice).

Wikimedia Commons
This is a database houses millions of media files that are either in the public domain or have a CC license. Please refer to each individual item to view the licensing.

This database provides access to the California State University IMAGE Project. It contains approximately 100,000 images from around the world that are available under the CC license: CC BY-NC 2.5. For more information about use of images check the “Conditions of Use of Website Images” section available form the main page.



Resource Guides

The following are guides to open content and educational resources.

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