Top 10 Best Free Online Libraries

1. Internet Archive: the largest digital library to download free ebooks.

2. Project Gutenberg: offers over 33000 free ebooks to read online and download.

3. Google Books: search full preview books then google will give you a link to downloadthe ebook if it’s not copyrighted.

4. University of Pennsylvania Books Page: lists over 1 million free books to read anddownload.

5. Open Library: over 1 million classic literature free ebooks to download.

6. eBooks at Adelaide: the online library of the University of Adelaide, offers free classic literature, philosophy, science and medicine ebooks.

7. Bartleby: provides the encyclopedia of world history and Harvard classics.

8. Bibliomania: offers over 2000 free electronic documents, as well as research results.

9. The New York Public Library: offers thousands of free ebooks in various formats.

10. ManyBooks: ads free library to download over 29,000 free ebooks.

Update:

11. Open J-Gate is the world’s biggest Open Access English Language Journals Portal, you can search and download papers from 8571 open access journals.