Open Educational Resource repositories listed here cover a wide variety of educational disciplines. They include OER targeted at both primary and secondary students.
OER Commons (oercommons.org) Curating best in class learning materials from around the world since 2007. The OER Commons is a single search source that pulls from multiple OER collections, including MERLOT and Connexions. It is a great first step in an OER search, but often more results can be found by searching the specific collection.
Users can create collections of existing content and create their own content pages to share.
The OER Commons is a supported by ISKME (the Institute for the Study of Knowledge Management in Education).
OpenStax CNX (formerly Connexions) (cnx.org) includes lectures, assignments, and written educational materials. Content can be created in the Connexions interface and housed within the Connections servers. Users can create collections of existing content and create their own content pages to share.
MERLOT (merlot.org) is a free and open peer reviewed collection of online teaching and learning materials and faculty-developed services contributed and used by an international education community. MERLOT was opened in 1997 and is supported by the California State University System.
MERLOT does not house content, but is a collection of links to other content. The materials can be ranked and many are peer-reviewed. There are discipline specific Communities that curate and review the content.
You can create and share personal collections of content links.
OpenWashington - (http://www.openwa.org) is a site designed to help you understand the OER movement and find OER. They have links for finding textbooks, content, images and video, as well as stories from faculty who have adopted OER in their classrooms.
Saylor.org is a non-profit organization sponsored by the Saylor Foundation, they are focused on bringing "freely available education to all." Founded in 1999 by Michael Saylor, they have created online courses curated from open content found on the Web. The courses are marketed toward students who just want to learn, and are working on some methods for offering credentials. For faculty, Saylor is a great site to start your search for OER by subject.
Orange Grove (http://florida.theorangegrove.org/og/access/home.do) is a online library of openly available instructional resources for Florida's educators.
The Orange Grove does not house content, but is a collection of links to other content.
Only Florida educators are allowed to have registered accounts, but anyone can search for and use content linked in the Grove. Some resources are only available to registered users.
This site is predominantly focused on K-12 content but there are links to content useful for introductory courses.
Europeana – is a gateway to European cultural assets, through this one site you can search for artworks, cultural items, archival collections from participating institutions all around Europe. This site is a gateway, and once you have selected the items you want you will be redirected to the website of the institution that owns the item, and often these sites will not have English translations. To find an item with the Creative Commons licensing you prefer -
Once you type in your initial search on the main page, you will have a list of filters on the left hand side of the page
Use the "Can I use it?" and "By Copyright" filters to narrow down your results
Canadiana - Canadiana.org is a coalition of members dedicated to providing broad access to Canada's documentary heritage. Through our membership alliance, Canadian libraries share tools and capacity, partner on open-source projects, and spearhead digital preservation in Canada.
The Public Domain Review - an online journal and not-for-profit project dedicated "to the exploration of curious and compelling works from the history of art, literature, and ideas." The project specifically focuses on works that are in the public domain, and therefore available for inclusion in courses as open educational resources.
Mason OER Metafinder (MOM):The OER Metafinder performs a simultaneous search across 19 different sources of open educational materials. Because it is a real-time, federated search, it can take a bit longer than searches of pre-indexed, curated content; however, as compensation the results returned are absolutely up-to-the-minute for each search target. Additional results will continue to trickle in as the search continues running and you begin examining your results.