The UNH Open Educational Resources Lib Guide is a good place to start your search for OER. The Lib Guide includes four search categories:

Open Textbooks

Open textbooks improve learning and teaching by ensuring that every student has access to the resources needed to succeed in a course from the first day of class. Open textbooks are free or low-cost on the web and modestly priced for downloads, use on eReaders, or in bound format.

OER Content/Courses

OER repositories are community portals that allow educators to share content. Some repositories include peer-review and rating systems. Open courses (or open courseware) are usually part of university initiatives to make full course content freely available to the public, but without access to faculty or certification of course completion. Like other OER, open course content can be adopted and adapted by educators.

OER by Subject

The Lib Guide lists sources by subject for Humanities and Social Sciences and Science/Technology/Engineering/Math. From interactive web sites to U.S. History to virtual chemistry labs, this list of sources by subject provides access to a wealth of OER.

Open Media

Digital libraries and other digital media collections contain a wide variety of content that is available for educational use. The examples posted here are a small sample of what is available. Many of these projects are maintained by academic libraries and not-for-profit institutions, and others are made available by commercial content providers. Reuse rights may vary. Check for Creative Commons licenses or other rights statements before re-posting online content. The fair use provisions of copyright apply even if content is posted with use restrictions.