CK-12 Foundation is a non-profit organisation 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.
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.
Open Library is a free, digital lending library of over 2 million eBooks that can be read in a browser or downloaded for reading off-line.
Opensource Textbooks
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
Project Gutenberg offers over 42,000 free ebooks: choose among free epub books, free kindle books, download them or read them online.
SpringerOpen Books
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.
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.