I have seen 13 most famous websites for free electronic version of books
Bartleby publishes digital versions of thousands of free classics including literature and nonfiction.
2. E-Books Directory
E-Books Directory is home to around 1,700 free electronic textbooks, documents and lecture notes.
The University of Adelaide in Australia offers a very user-friendly eBook search experience. You can browse the books it offers by author, title or by using the Google-powered search function.
4. Flat World Knowledge
Flat World Knowledge is the world’s largest publisher of free college textbooks.
5. Free eBook-s
A free eBook search engine that allows you to search the internet for already-known eBook listings.
6. Google Books
With Google Books, you can search (shocking, I know) and preview millions of books from libraries and publishers around the world.
7. Many Books
Many Books is an index of over 29,000 free works that can be searched by author or title.
NeoTake is neat for a couple of reasons. First, this website has indexed over 5.4 million eBooks and ePrints (not all of which are free). Second, it allows you to read reviews so that you can select the best version for your class.
9. Open Culture
Open Culture provides links to 300 free eBooks including Don Quixote, Heart of Darkness, The Red Badge of Courage, Les Miserables, Animal Farm, MacBeth and The War of the Worlds.
10. Open Library
The headline on the Open Library website is, “The World’s classic literature at your fingertips. Over 1,000,000 free eBook titles available.” ‘Nuff said?
11. Planet eBook
All of the electronic novels and books that are available on Planet eBook are free for you to download and share with your students and colleagues.
12. Project Gutenburg
Project Gutenberg offers 39,000 free eBooks. Some of the top downloads are The Adventures of Sherlock Holmes, Pride and Prejudice, Adventures of Huckleberry Finn, Frankenstein, Dracula and Jane Eyre.
13. Science Books Online
I’m guessing that you already have an idea of the kind of eBooks that Science Books Online offers, but in case you’re not feeling very imaginative today, this website lists free science eBooks, textbooks, lecture notes, monographs and other science-related documents.