OER are:
teaching, learning, and research resources that are free of cost and access barriers, and which also carry legal permission for open use. Generally, this permission is granted by use of an open license... which allows anyone to freely use, adapt and share the resource—anytime, anywhere.
Often in OER Organizations and projects, you will find a saying much like the three R's of recycling. For OER, it is the five R's:
To quickly summarize the potential benefits of OER:
This section provides you with links to OER organizations not otherwise listed in the other sections.
For further information, check out the OER Organizations page