Project Gutenberg - Project Gutenberg offers free ebooks to download.
Standard Ebooks - Online library of downloadable e-books that focuses on quality and modern standards in typography.
libgen.pw - 2 330 367 BOOKS 533 572 COMICS 2 791 901 ARTICLES
Forgotten Books - Forgotten Books is a gigantic online library with over 400,000 books.
Archive.org - Internet Archive is a non-profit digital library offering free universal access to books, movies...
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.