UC Davis hosts a powerful program for open textbooks (CC-BY-SA-NC). Topics trend towards STEM, but there are some Humanities there as well. Great interface and search with amazing resources.
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The CCCOER is a wonderful resource for understanding open and for discovering content. The catalog of OER repositories they have is well organized.
Run by the University of Minnesota, the Open Textbook Library is a collection of open textbooks, searchable by subject. Great interface, and the catalog is very good.
WikiBooks is a website that allows for crowd-sourced content (anyone can edit a book). The content tends to be very good, though the look and feel of the website is very utilitarian.
We don’t know exactly what is happening at Amazon Inspire, but it looks like Amazon will be a great repository for open content for K-12 institutions. They are in the Beta version now, so stay tuned!
Although a small collection of books, these open books are authored by professionals and peer reviewed. They also align with standard scope and sequence requirements. The books are available online and as a PDF, although some of them can also be ordered in print (~$30) or obtained in the iTunes bookstore.
One of the best resources for open content! This site is indexed and searchable (by topic, by resource type, by academic level, and by standard), and the content is reliably open (and vetted).
Open SUNY Textbooks is an endeavor of the State University of New York and provides high-quality textbooks written and edited by professionals.
A phenomena, curated collection of OER. Searchable by topic, and filtered by type (textbooks, case studies, quizzes, etc.)
A good place to go when looking for content. You’ll likely have to invest time in finding great content. This site aggregates different resources – although the organization is great – but some of the links bring you to dead links, content that isn’t easy to edit, and content that is old.