The Internet Archive is building a digital library of Internet sites and other cultural artifacts in digital form. Like a paper library, it provides free access to researchers, historians, scholars, the print disabled, and the general public.
Project Gutenberg is a library of over 60,000 free eBooks. Choose among free epub and Kindle eBooks, download them or read them online. You will find the world's great literature here, with focus on older works for which U.S. copyright has expired.
Forgotten Books is an independent publisher focusing on the rescue and restoration of old books. There are over 400,000 different books available on every topic from classic fiction, history, ancient knowledge, religion, spirituality, philosophy and many more.
BrainAB provides an accessible archive of classic books for students. The library is searchable by title or author and downloads are freely available in Apple ePub, Amazon Kindle and Adobe PDF formats.