Open Educational Resources (OER) are educational materials that are freely available for use, reuse, modification, and sharing.
These resources can include:
OER are typically released under open licenses, such as Creative Commons licenses, which grant users the permissions to retain, reuse, revise, remix, and redistribute the content.
PDF: Open Education Fact Sheet

The Open Education movement is built around the 5Rs of Open [2]. Open Educational Resources are licensed in such a way that enables adopters to utilize the 5 Rs:
Creative Commons Licensed by The Council of State School Officers
With so many free resources available online, it is often difficult to determine which content is most appropriate to use. Below are some helpful tools to assist you in evaluating an open educational resource.
Remember to keep your student learning outcomes in mind and to modify any exams, assignments, or assessments to reflect the new resources.
The Institute for the Study of Knowledge Management in Education (ISKME) launched the OER Commons in 2007, to support and build a knowledge base around the use and reuse of open educational resources (OER). As a network for teaching and learning materials, the site offers engagement with resources for curriculum alignment, quality evaluation, social bookmarking, tagging, rating, and reviewing.
The Scholarly Publishing and Academic Resources Coalition (SPARC) is an international alliance of academic and research libraries working to create a more open system of scholarly communication. View their helpful OER Fact Sheet PDF to learn more about Open Educational Resources, how they are used, and why they are important.
The Faculty OER Toolkit by Shannon Moist is an information resource about and guide to adapting and adopting Open Educational Resources. Included are definitions and examples, information about Creative Commons licensing, and tips on how to adapt and/or adopt OER for classroom use.
The OER Starter Kit by Abbey Elder provides instructors with an introduction to the use and creation of open educational resources (OER). The text is broken into five sections: Getting Started, Copyright, Finding OER, Teaching with OER, and Creating OER. Although some chapters contain more advanced content, the starter kit is primarily intended for users who are entirely new to Open Education.
The White Rose Libraries Open Educational Resources Toolkit from the universities of Leeds, Sheffield and York, provides information and tools to help faculty and library staff to understand, engage with, and sustain OER in their work and practice.
The OER Advisory Council is comprised of one representative from each of the 28 undergraduate-serving public institutions. The advisory council serves to expand OER use on campuses and to provide advice and counsel for statewide OER implementation. The statewide OER advisory council and the statewide OER coordinator are responsible for implementing the short-term recommendations and developing plans, after conducting additional research, for how to implement the mid and long-term recommendations.