Open Culture
Download over 900 free audiobooks and eBooks. Listen to interesting lectures and recordings of authors reading from their works.
Open Library
Read thousands of classic books online.
Project Gutenberg
Over 56,000 free eBooks in the public domain, especially older works whose copyright has expired.
Google Books
Search, preview, and read public domain books in PDF or ePub format. Search by author, title, keyword and read all or part of the book.