Open Education Resources are “teaching, learning and research materials in any medium – digital or otherwise – that reside in the public domain or have been released under an open license that permits no-cost access, use, adaptation and redistribution by others with no or limited restrictions.” (UNESCO) Below are a number of locations to search for OERs.
The terms "open content" and "open educational resources" describe any copyrightable work (traditionally excluding software, which is described by other terms like "open source") that is either (1) in the public domain or (2) licensed in a manner that provides everyone with free and perpetual permission to engage in the 5R activities:
The above is adapted from original writing by David Wiley, published under a Creative Commons Attribution 4.0 license.
There are a number of reasons one might wish to use an OER:
Below are some locations where you can find Open Educational Resources: