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Open textbooks are textbooks that have been funded, published, and licensed to be freely used, adapted, and distributed. These books have been reviewed by faculty from a variety of colleges and universities to assess their quality. These books can be downloaded for no cost, or printed at low cost. All textbooks are either used at multiple higher education institutions; or affiliated with an institution, scholarly society, or professional organization.
Bookboon is one of the largest publishers of open source textbooks with hundreds of titles available. Their books are all free and able to be downloaded as PDFs. They fund their titles with limited employer brand advertisements. Their books are not customizable but are open access. Bookboon also makes titles available to a global audience.
College Open Textbooks Collaborative
This initiative has open textbooks that have been adopted by more than 2000 programs. They collect open textbooks from a variety of colleges and universities. They wish to raise awareness of the availability of free, open textbooks and increase the adoption of those books by two-year programs. You can browse their catalog by subject or by viewing recommended books
Global Text Project Books
Affiliated with the Saylor Foundation, the Global Text Project is an initiative originally funded by the Jacobs Foundation and dedicated to providing freely accessible textbooks to students all over the world. They have information on their site for authors who wish to submit their textbooks to be used for their courses. All books on the site are released under a Creative Commons license. Individual chapters are available and can be edited by instructors to suit the needs of their course.
National Academies Press
The National Academies Press (NAP) was created by the National Academy of Sciences to publish the reports of the National Academies of Sciences, Engineering and Medicine, operating under a charter granted by the Congress of the United States. The NAP publishes more than 200 books a year on a wide range of topics in science, engineering, and medicine, providing authoritative information on important matters in science and health policy. They offer more than 5,000 titles in PDF format. Almost all of these PDFs can be downloaded for free by the chapter or the entire book.
Open Culture Textbooks
Open Culture is a site, founded in 2006, dedicated to collecting links to free educational and cultural media for the general public. Their editorial board includes several teachers and academics. While this link goes directly to their list of free textbooks, they also provide information on free online courses, audio books, movies, language learning resources, and ebooks.
OpenStax believes that everyone has something to learn, and everyone has something to teach.
Frustrated by the limitations of traditional textbooks and courses, Dr. Richard Baraniuk founded OpenStax (then Connexions) in 1999 at Rice University to provide authors and learners with an open space where they can share and freely adapt educational materials such as courses, books, and reports. Today, OpenStax CNX is a dynamic non-profit digital ecosystem serving millions of users per month in the delivery of educational content to improve learning outcomes. There are tens of thousands of learning objects, called pages, that are organized into thousands of textbook-style books in a host of disciplines, all easily accessible online and downloadable to almost any device, anywhere, anytime. The best part? Everything is available for free thanks to generous support from Rice University and several philanthropic organizations.
Openstax is an initiative started by Rice University. They aim to improve free student access to quality textbooks. In order to accomplish this, they encourage instructors to customize the available texts, try out chapters of them in their classes, and hopefully adopt them. Anyone can browse their textbook selection and read a title that is of interest.
Open Textbook Library
In partnership with many colleges and universities, the Open Textbook Library licenses textbook to make them available for free to students and faculty. You can browse their titles by subject or search for particular books.
Saylor Foundation Books
The Saylor Foundation is part of the Open Educational Resources community. They provide free, online, non-degree courses in a variety of subjects. Their textbooks are also available to use for free onlin