[Endeavor]

archive.org/details/texts - The Internet Archive's immense archive of ebooks.

libgen.fun - Most popular ebook site and provides several mirrors to ebooks including torrents. Textbook focused. If you have any textbook or any other educational book to share, this is the place. For any book not available, make a request in the respective thread in the forums

libgen.rs - Libgen mirror

z-lib.org - Z-Library. Books and articles. Mirrors libgen library.

pdfdrive.com - PDF file search engine

the-eye.eu/public/Books - The Eye's extensive eBooks archive

forcoder.su - Focuses on programming textbooks

mobilism.org - Large warez board that contains a request subforum

freebookspot.es

ebookee.org

s2.bitdownload.ir - Open directory of eBooks

s3.bitdownload.ir - Open directory of eBooks

[sobczykRUS]

libgen and zlibrary are the best

i can agree 100%

[patrickcool4]

i cannot see the link where is ti

[silkyyy]

I used Libgen all through college, never once bought a book!

[Th3C0pp3r]

I recommend Zlib right now

[nok32]

libgen is nearly perfect. In the rare situation that I can't find what I'm looking for there, I also like to check the ebook forum at mobilism.me which also is pretty great for audio books.