Open Educational Resources (OER) is a platform for copyright-free online educational resources. There are lots of resources in different formats. Most of the resources are free from copyright. There are different Content Repositories, Portal Repository, Content+Portal Repositories. These are as follows:
For images: Flickr Creative Commons
https://www.flickr.com/creativecommons/
Google Advanced Search
https://www.google.com/advanced_search
For video: Vimeo
https://vimeo.com/creativecommons
For text, etc: OER Commons
https://www.oercommons.org/
Directory of Open Educational Resources (DOER), COL
http://doer.col.org/
OASIS [COL’s eLibrary]
http://oasis.col.org/
Wikimedia Commons
https://commons.wikimedia.org/wiki/Main_Page
Wiki books
https://en.wikibooks.org/wiki/Main_Page
Openstax CNX
https://cnx.org/browse
Khan Academy
https://www.khanacademy.org/
Saylor.com
https://www.saylor.org/
Global Text Project [30 textbooks management and technology]
● ESC Library's OER Guide
- A starting place to find OER repositories and lists.
- They are categorized by the type of OER: Open Textbook, Open Course, and smaller OER…
- http://subjectguides.esc.edu/oer
● Open Educational Resources: "Single Serving" OERs
● Open Textbooks: Open Textbook Repositories
● Open Educational Resources: Open Courses