Site for Download books in pdf form

Hello, I was wondering if any can point me to good sites which have engineering books and PDFs for dl not in torrent.
Thanks

Answer #1
You can look at this site but your best bet is to search the link heaven section for “ebook” or ebooks.
There are tons of sites.
http://ebooksonengineering.blogspot.com/
http://www.ebookw.com/
Answer #2
http://library.nu/
Answer #3
Gjoksi replied: http://library.nu/
thanks but it is impossible to sign up anymore