Open access textbooks are openly-licensed digital textbooks that are offered for free online. Traditional textbooks use cumbersome copyright license restrictions, while open access textbook allow anyone to read, copy, distribute, or modify the content at no cost. Many universities around the United States have already developed initiatives to produce peer-reviewed open access textbooks for their students and the positive response has lead open access textbooks to be acknowledged as an affordable alternative to traditional learning materials.

Open Access Textbook Repository Database

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ALT Open Access RepositoryA project which aims to provide a resource base and supporting technologies to ensure effective support for e-learning professionals. It is a collaboration between Cranfield University and the Association for Learning and Technology (ALT).

Subjects (# of Titles): Education (809), Technology (354)
American Institute of Mathematics Open Textbook InitiativeA list of open access mathematics textbooks that have been evaluated and approved for use in a traditional university course. The American Institute of Mathematics Editorial Board has developed evaluation criteria to identify the books that are suitable for use in traditional university courses. The Editorial Board maintains a list of Approved Textbooks which have been judged to meet these criteria.

Subjects (# of Titles): Mathematics (30)
BookBoonA collection of free eBooks for students and business professionals. The books can be downloaded in PDF without registration.

Subjects (# of Titles): Accounting (147), Business (200), Economics (56), Engineering (114), Languages (11), Marketing (22), Mathematics (116), Science (68), Technology (115)
FREE-Federal Resources for Educational ResourcesA repository of digital teaching and learning resources created and maintained by the federal government and public and private organizations.

Subjects (# of Titles): Liberal Arts (2,028), Health (138), Language Arts (896), Mathematics (4,298), U.S. History (12,575), World Studies (981)
iBerryA collection of open access materials and resources for learners, educators, researchers.

Subjects: Arts, Computer Science, Earth Science, Engineering, Health Science, Humanities, Mathematics, Physical Science, Social Science
iLuminaA digital library of sharable undergraduate teaching materials. It is designed to quickly and accurately connect users with the educational resources they need. These resources range in type from highly granular objects such as individual images and video clips to entire courses.

Subjects: Biology, Chemistry, Mathematics, Physics, Technology
Internet ArchiveA non-profit with the purpose of offering permanent access for researchers, historians, scholars, people with disabilities, and the general public to historical collections that exist in digital format. Over 6,000,000 fully accessible public domain eBooks are available.

Subjects (# of Titles): Historical (6,000,000)
Learning ExchangeA collection of thousands of learning resources specifically for social services education and training. These include information sheets, official publications, interactive learning resources, video clips, case studies, podcasts and radio broadcasts.It is maintained by the Institute for Research and Innovation in Social Services.

Subjects (# of Titles): Social Science (5,635)
MERLOT IIA free, peer reviewed collection of online teaching and learning materials and faculty-developed services.It is maintained by the California State University System.

Subjects (# of Titles): Arts (1,703), Business (5,124), Education (6,953), Humanities (6,879), Mathematics (3,804), Science (18,024), Social Science (4,325)
National Engineering Education Delivery SystemA digital library of learning resources for engineering education. It provides web-based access to a database of learning resources where the user can search for, locate, download, and comment on resources to aid their learning or teaching process. In addition, the library supports a multi-tier evaluation system from our national award competition with sponsors from industry to user-based reviews of individual learning resources.

Subjects: Engineering, Mathematics
National Science Digital LibraryA digital library which provides high quality online educational resources for teaching and learning, with current emphasis on the sciences, technology, engineering, and mathematics (STEM) disciplines—both formal and informal, institutional and individual, in local, state, national, and international educational settings.

Subjects: Engineering, Mathematics, Sciences, Technology
North Carolina Learning Object RepositoryA collection of documents, audio/video clips, simulations, learning modules, assessments, and more – virtually any type of learning resource that can be digitized and processed.

Subjects (# of Titles): Agriculture (1,915), Arts (3,895), Business (639), Design (43), Education (262), Engineering (881), Health (1,122), Language Arts (330), Mathematics (3,598), Physical Science (2,340), Social Science (747), Technical (481), Technology (181)
OER CommonsA digital content hub of teaching and learning materials freely available for everyone to use, whether you are a teacher or a learner. This includes full courses, modules, syllabi, lectures, homework assignments, quizzes, lab activities, pedagogical materials, games, simulations, and many more resources contained in digital media collections from around the world.

Subjects (# of Titles): Arts (3,239), Business (1,401), Humanities (14,576), Mathematics (11,558), Sciences (22,482), Social Science (11,774)
Open CourseWare InitiativeA web-based publication of virtually all Massachusetts Institute of Technology course content. It is open and available to the world and is a permanent MIT activity.

Subjects: Business, Education, Energy, Engineering, Fine Arts, Health, Humanities, Mathematics, Science, Social Science, Sociology
Open Doar - Open AccessA directory of academic open access repositories. Each repository has been visited by project staff to check the information that is recorded there. This in-depth approach does not rely on automated analysis and gives a quality-controlled list of repositories. It is maintained by SHERPA Services at the University of Nottingham.

Subjects: All
Open Textbook LibraryAn online library to help instructors find affordable, quality open access textbook solutions. All textbooks in this library are complete and openly licensed.It is partnered with the University of Minnesota, BC Campus, and Perdue University.

Subjects (# of Titles): Accounting (5), Business (31), Economics (11), Education (5), Humanities (9), Law (26), Mathematics (30), Physical Science (24), Social Science (9), Technology (14)
OpenStax CNXA website to view and share free educational material in small modules that can be organized as courses, books, reports or other academic assignments.It is supported by William & Flora Hewlett Foundation, Bill & Melinda Gates Foundation, 20 Million Minds Foundation, Maxfield Foundation, Open Society Foundations, and Rice University.

Subjects (# of Titles): Arts (1,458), Business (39), Humanities (119), Mathematics (26), Social Science (155), Technology (84)
Orange GroveFlorida's digital repository for instructional resources. The repository provides an environment for educators to search for, use, remix, share, and contribute educational resources.

Subjects: Business, Communication, Education, Engineering, Health, Humanities, Mathematics, Science, Social Science, Technical, Visual Arts
Resource RepositoryA digital commons for the global health community. This electronic collection of documents, links, audio, and video files, relies on contributions from the community. It is maintained by the non-profit organization Genetic Alliance.

Subjects: Education, Global Health
USF Scholar Commons Open Access TextbooksTextbooks submitted to this collection are free and available to anyone, but are best suited for higher education.

Subjects: Behavioral Research, Journalism, Mathematics, Writing