Open Textbooks

Open Textbooks for Hong Kong
Offers over 100 textbooks for tertiary institutions.

BCcampus OpenEd
Textbooks created or revised by post-secondary faculty in British Columbia, Canada, and made available under a Creative Commons license.

DOER - Directory of Open Access Books
A directory of academic peer review books from over 70 publishers.

InTech
Open access books in science, technology, and medicine.

LibreTexts - Chemistry | Biology | Geosciences | Mathematics | Statistics | Physics | Social Sciences | Engineering | Medicine | Agriculture | Photosciences | Humanities
A multi-institutional collaborative venture to develop the next generation of open-access textbooks.

The National Academic Press
Covers over 5,000 reports published by the National Academies Press for the National Academy of Sciences, National Academy of Engineering, Institute of Medicine and National Research Council in the US.

OAPEN Library
Contains freely accessible academic books, mainly in the area of humanities and social sciences.

Open Access eBooks on JSTOR
Provides Open Access ebooks from leading publishers such as University of California Press, University of Michigan Press, ANU Press, and Cornell University Press.

Open SUNY Textbooks
An open access textbook publishing initiative established by State University of New York libraries.

Open Textbook Library by University of Minnesota
Provides free, peer-reviewed, and openly-licensed textbooks.

OpenStax 
Offers openly licensed college textbooks.

University of Oxford Text Archive
Covers literary and linguistic resources in more than 25 different languages for use in higher education, research, teaching and learning.