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Directory of Open Access Books
IntechOpen is specifically for scientists. It is the the world's leading publisher of Open Access books. In addition, their books are submitted to relevant abstracting and indexing services including Web of Science - Book Citation Index, Crossref, Google Scholar, WorldCat, BASE, EBSCO A-to-Z, Open AIRE, CNKI Scholar, RePEc, ExLibris SFX.
OASIS currently searches open content from 117 different sources and contains 388,707 records.
Their goal is to provide a page on the web for every book ever published. At its heart, Open Library is a catalog.
Open Stax Textbooks
OpenStax publishes high-quality, peer-reviewed, openly licensed textbooks that are absolutely free online and low cost in print. For all our available formats, visit openstax.org and select the subject that interests you.
Open Textbook Library
Open textbooks are licensed by authors and publishers to be freely used and adapted. Download, edit and distribute them at no cost.
The Open Textbook Library is supported by the Open Education Network
Saylor Academy Open Textbooks
Saylor Academy has textbooks available by subject that are reproduced without attribution to the authors or original publisher, as requested by the licensor, and are available under a CC BY-NC-SA 3.0 license. PDF copies are available (under slightly different titles) at the 2012 Book Archive. Many of these titles are also available in various formats through the Open Textbook Library and BCcampus. Saylow Academy also contains free certification courses, courses built from curated OER, and for-credit courses.
Project Gutenberg is an online library of free eBooks. It was the first provider of free electronic books, or eBooks. Project Gutenberg's mission statement is "To encourage the creation and distribution of eBooks."