Open educational resources
Open Educational Resources (OER) are documents, media, software and processes that are useful to teaching, learning, education and assessment, and that are made openly accessible and reusable by anyone for any purpose, free of barriers or restrictions. 
To achieve this, OER is typically (but not only) published and distributed through the Internet, in a format that can be freely used and modified, carrying a copyright license that permits free and unrestricted reuse - provided the original author is attributed, and sometimes provided derivatives are republished with the same reusable copyright.
This resource aims to bring some clarity to what OERs are, and how people can use them.
OER has a number of interests, from international agencies like the United Nations, through to individual practitioners who share many of the principles and values. This section highlights some of these interests.
By far the largest and most flexible platform for OER is the Wikimedia Foundation, hosting and administering multi lingual and open source sites like Wikipedia, Wikimedia Commons, Wikibooks, Wikiversity and many others. Wikipedia alone is now the world's 6th most visited website,  and the other projects are linked to that in various ways.
UNESCO is a very early proponent of OERs and they are accredited with establishing the phrase OER. 
The OECD published a 147 page report in 2007 called, Giving Knowledge for Free. The emergence of open educational resources. 
The Hewlett Foundation has granted hundreds of millions of dollars to open educational development, in California and Internationally, for over 10 years.
Funded by the Hewlett Foundation and supported by the Commonwealth of Learning, Otago Polytechnic, and Athabasca University, the OER Foundation administers the Wikieducator project and the Open Education Resources University.