Open Educational Resources (OER) are teaching and learning materials that you may freely use and reuse at no cost. Unlike fixed, copyrighted resources, OER have been authored or created by an individual or organization that chooses to retain few, if any, ownership rights. In some cases, that means you can download a resource and share it with colleagues and students. In other cases, you may be able to download a resource, edit it in some way, and then re-post it as a remixed work. How do you know your options? OER often have a Creative Commons or GNU license to let you know how the material may be used, reused, adapted, and shared.

Wikimedia Commons: Wikimedia Commons is a media file repository making available public domain and freely-licensed educational media content (images, sound and video clips) to everyone, in their own language. It acts as a common repository for the various projects of theWikimedia Foundation, but you do not need to belong to one of those projects to use media hosted here. The repository is created and maintained not by paid archivists, but by volunteers. The scope of Commons is set out on the project scope pages.

https://commons.wikimedia.org/wiki/Main_Page

Open Educational Resources (OER) are teaching and learning materials that you may freely use and reuse at no cost. Unlike fixed, copyrighted resources, OER have been authored or created by an individual or organization that chooses to retain few, if any, ownership rights. In some cases, that means you can download a resource and share it with colleagues and students. In other cases, you may be able to download a resource, edit it in some way, and then re-post it as a remixed work. How do you know your options? OER often have a Creative Commons or GNU license to let you know how the material may be used, reused, adapted, and shared.

https://www.oercommons.org/

The MERLOT project began in 1997, when the California State University Center for Distributed Learning (CSU-CDL at www.cdl.edu) developed and provided free access to MERLOT (www.merlot.org). Under the leadership of Chuck Schneebeck, CSU-CDL's Director, MERLOT was modeled after the NSF funded project, "Authoring Tools and An Educational Object Economy (EOE)". Led by Dr. James Spohre and hosted by Apple Computer, and other industry, university, and government collaborators, the EOE developed and distributed tools to enable the formation of communities engaged in building shared knowledge bases of learning materials.

https://www.merlot.org/merlot/index.htm?action=find

Open Textbooks at UMN: You can ensure that ALL of your students will have access to your course textbook content. In addition, you can edit the textbooks to fit your courses and best meet the needs of your students. Open textbooks are real, complete textbooks licensed so teachers and students can freely use, adapt, and distribute the material. Open textbooks can be downloaded for no cost, or printed inexpensively.

This library is a tool to help instructors find affordable, quality textbook solutions. All textbooks in this library are complete and openly licensed.

http://open.umn.edu/opentextbooks/SearchResults.aspx?subjectAreaId=11