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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.


Digital Public Library of America

Portal to millions of digitized images, documents, and primary source materials from America's archives, libraries, and museums.

Pixabay is a database of more than 500,000 photos, illustrations, vector graphics and videos released with an open license and no required attribution. 

Wikimedia commons
This is a database of nearly 30 million media files that are either in the public domain or Creative Commons licensed. You may check any individual item you find to view the licensing.

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

Images, videos, documents, and audio files from public institutional collections. When doing a search, freely available items are labeled as "PUBLIC."

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 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 30,000 public domain images from the CMA's world-renowned collection. When doing a search, use "Show only" and select "Open Access" for these images. 

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

Flickr Advanced Search
Use the advanced search feature to limit your image search by size, date, and creative commons licenses.

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 the advanced search facets to limit the usage rights of the images you search.


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

Open Content Program

Digital images to which the J. Paul Getty Museum holds the rights or that are in the public domain may be used for any purpose. No permission is required. When using the Getty Search Gateway to look for images, make sure the "Open Content Images" filter is selected.

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 Creative Commons licenses. For more information about restrictions to the use of the images check the “Conditions of Use of Website Images” section available form the main page. [5/25/21 - This resource not available.]


Free high-resolution images gifted by the global community of photographers for commercial and noncommercial use. Utilizes the Unsplash License.

This is an online resource for visual arts that includes a collection of over 100,000 images available for educational use.



Resource Guides

The following are guides to open content and educational resources.

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