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. The library currently includes 714 textbooks, with more being added all the time.
The primary aim of DOAB is to increase discoverability of Open Access books. Academic publishers are invited to provide metadata of their Open Access books to DOAB.
InTech is the world's largest science, technology, and medicine open access book publisher with a collection of nearly 3,000 open books,
The Internet Archive consists of legitimate digitized older open access textbooks
The OAPEN Library contains freely accessible academic books, mainly in the area of Humanities and Social Sciences. OAPEN works with publishers to build a quality controlled collection of Open Access books, and provides services for publishers, libraries and research funders in the areas of dissemination, quality assurance and digital preservation.
Open Access eBooks is an international publisher of eBooks. Open Access eBooks covers different disciplines of science, technology and medicine. Each eBook contains around 6 or 7 book chapters providing the latest information to the readers
Freely licensed textbooks available to read online or download in multiple formats, including some classroom resources.
Project Gutenberg has a 60 000 free eBooks library
Springer Nature publishes open access (OA) books and chapters under its Springer, Palgrave Macmillan and Apress imprints. We helped to pioneer open access book publishing, first piloting open access publication for books in 2011. We publish open access books across a wide range of areas in science, technology, medicine (STM), and humanities and social sciences (HSS). Quoted directly from SpringerNature