CK-12 Foundation is a non-profit organization that creates and aggregates high quality, curated STEM content, including over 5,000 math and science concepts and FlexBooks with multiple modalities for all learning types including: videos, images, reading, simulations, real world applications, activities, flashcards, study guides, assessments and more.
College Open Textbooks
The College Open Textbooks Collaborative, a collection of twenty-nine educational non-profit and for-profit organizations, affiliated with more than 200 colleges, is focused on driving awareness and adoptions of open textbooks.
Directory of Open Access Books
A searchable index of peer-reviewed books published under Open Access with links to the full-text at publisher websites or repositories.
The University of Adelaide Library’s collection of Web books “includes more than 700 classic works of Literature, Philosophy, Science, and History. Each work has been carefully formatted for maximum readability either on screen or when printed.
Free eBooks: The ultimate guide
Every site and page listed in this guide offers quality eBooks for absolutely no charge.
Open Book Project
The Open Book Project is aimed at the educational community and seeks to encourage and coordinate collaboration among students and teachers for the development of high quality, freely distributable textbooks and educational materials on a wide range of topics.
OpenLibrary.org is a free, digital lending library of over 2 million eBooks that can be read in a browser or downloaded for reading off-line.
The Internet Archive is a non-profit, is building a digital library of Internet sites. Provides free access to researchers, historians, scholars, the print disabled, and the general public.
Page by Page Books
These are electronic versions of hundreds of the best public domain books, available in easy to read format.
Project Gutenberg offers over 42,000 free ebooks: choose among free epub books, free kindle books, download them or read them online.
SpringerOpen books are freely and immediately available online at SpringerLink upon publication and are clearly labeled as ‘open access’. They are accessible to anyone worldwide, which ensures distribution to the widest possible audience.
Textbook Revolution is a student-run site dedicated to increasing the use of free educational materials by teachers and professors. On this site you’ll find links and reviews of textbooks and select educational resources.
The Online Books Page
Listing over one million free books on the Web in a variety of disciplines from the University of Pennsylvania.
World Digital Library
The World Digital Library (WDL) makes available on the Internet, free of charge and in multilingual format, significant primary materials from countries and cultures around the world.