Open Libary
Open Library is an initiative of the Internet Archive, a 501(c)(3) non-profit, building a digital library of Internet sites and other cultural artifacts in digital form
Internet Archive
Internet Archive is a non-profit library of millions of free books, movies, software, music, websites, and more.
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.
Project Gutenberg
Project Gutenberg is a library of over 60,000 free eBooks. Choose among free epub and Kindle eBooks, download them or read them online.
Directory of Open Access Books (DOAB)
DOAB is a discovery service for peer reviewed open access books and book publishers that indexes and provides access to high quality, open access, peer-reviewed books.