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Open Educational Resources (OER): Open Textbooks & Other Learning Materials

This guide offers ideas and resources for faculty interested in locating, adapting, or creating fully open learning materials as well as freely accessible and lower-cost textbooks and learning resources.


Open Educational Resources (OER) are no cost materials that support teaching, learning, and research. These include textbooks, interactive learning materials, quizzes, images, media, software, lab manuals, games, online lectures, and more.

But OER is not just free stuff.  The OER gold standard is material that’s free and openly licensed, giving users the freedom to do the "5 R’s" of Open: Retain, Reuse, Redistribute, Revise, and Remix. Openly licensed materials allow all you the maximum flexibility to match your teaching goals. See the Creative Commons tab for more information on open licensing.

See the Open Education Group publications page for research and writings on OER effectiveness and related issues.  

One Search Options: OASIS, MOM, and ISBN

These one search options search multiple sites with open content that can be edited, shared, etc., as well as collections with free materials that cannot be adapted, but can be used as is.  Though these searches may retrieve just what you need, these options have significant content and search limitations, including fewer deep filtering choices found on other sites.  Not successful here? Try the repositories listed in the column to the right.  

oasis logo
Advanced Search Simultaneously searches more than 50 open material sites and over 155,000 resources. Developed by Milne Library at SUNY Geneseo.
Mason OER Metafinder (MOM)
Advanced Search Developed by George Mason University, this metafinder simultaneously searches 18 OER sites and primary source repositories.

Enter the ISBN of a book below to find related FREE eTextbooks. You may need to try a few, such as ISBN's associated with paperback, hardback, etc.

Find OER on the Web: Strategies

In addition to the major open educational resource collections highlighted in the middle column, locate OER's by using a search engine like Google or Bing.  Just note that pinpointing vetted resources is more random in this method. 

Locating OER on the Web:

  • Combine a word or phrase describing your subject with one of these terms (or others you find)

open textbooks | education resources | simulation | open resources | lessons or lesson plans | courseware | introduction[topic word] | creative commons | games
Example: engineering open textbooks

  • Consider doing a search that will only retrieve educational or government sites by combining subject terms with or  Example: biology education resources
  • Do a Google Advanced Search and limit Usage Rights to locate open textbooks.

Limit the Rights to "free to use, share, or modify, even commercially"

  • Look for options to limit Usage Rights on other websites, as well, such as YouTube

OER Starter Kit

OER Support: Education, Activism, Community

Find OER in Repositories & Referatories

Large OER collections which contain or point to learning materials can be a great place to start your OER discovery.  The first four below are the largest. The OER by Disciplines guide may reveal unique options.

  • Free  online books. This link leads to a related Auraria Library guide identifying web collections featuring free ebooks, such as Internet Archive and HathiBooks. Not all are appropriate as classroom learning support materials.

Find Images

Simulations and Experiments

Value-Added Textbook Ancillaries

A major OER concern is the frequent lack of such supplementary materials as assessments, or support tools that assist with activities like grading. Options to address these concerns include:

Free add-ons.  Many of the OER repositories listed on this page will note if supplementary support materials have been added, and may also include the option to create and add your own for use by all. 

Stand-alone ancillaries may also match textbook content or achieve learning goals.

Fee-based add-ons.  Some OER suppliers, such as OpenStax, have partnerships, prominently offered, with companies and publishers that supply support tools and resources at reasonable costs.

Open Access? Open Educational Resource?

What's the difference between Open Access (OA) and Open Educational Resources?

  • Open Educational Resources refer most frequently to materials created to support teaching and learning with open licensing.  (The phrase sometimes encompasses research materials.)
  • Open Access refers to scholarly materials that are freely available to users and refers to specific OA scholarly publishing models that vary from the traditional journal/scholar model.

Wait.  Sounds like there's cross-over in the two definitions.

  • Yes.  But knowing there is some difference should help alleviate confusion when reading about one or the other!

Below are some large OA repositories for journals and discipline-specific materials.  

An Open Access overview: