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American Institute of Mathematics
Boundless : Hosted by Lumen Learning
Free Tech Books
Computer science, mathematics, engineering and programming books, textbooks & lecture notes
College level textbooks.
LibreTexts : Click on Explore the Libraries for specific subjects.
Biology, Business, Chemistry, Engineering, Geosciences, Humanities, Mathematics, Medicine, Photosciences, Physics, Social Sciences, Statistics.
Michigan Open Book Project : Social Studies Textbooks
Social Studies Textbooks. CC-BY-NC-SA
NOBA : Provides modules covering the traditional scope of introductory psychology and related topics.
200 Free Textbooks curated from various sites.
Open Text Book Store
Math : Algebra, Geometry, Statistics, Calculus
Open Textbook Library
Variety of topics. Each book has individual creative commons license.
Two formats: modules, which are like small "knowledge chunks," and collections, which are groups of modules structured into books or course notes, or for other uses. Our open license allows for free use and reuse of all our content.
Saylor Academy Open Textbooks
CC BY-NC-SA 3.0
Course Site : Educators can use all or parts of books and courses.
USHistory.org : Free Textbooks
Offers high school textbooks in US History, American Government, and Ancient Civilizations.