Just like it says, here is a free, no registration required open library of over 7,000 PDF ebooks.
PDF Books http://pdfbooks.co.za/index.php
The copyright of many well-known books has expired and they now fall into the public domain. The books in the OPEN LITERATURE section of this website were obtained from Project Gutenberg, which is a massive volunteer-driven effort to capture public domain books into an electronic format. Project Gutenberg attempts to store the captured books in as timeless a format as possible, by using only straight text and in limited cases HTML. The goal of this website was to make many of these books available in the easy-to-read and easy-to-print PDF format. The books are available for download free-of-charge and without requiring user registration.
The Unpublished Work
section is intended to give unpublished authors a sounding board to expose their work.