Perhaps, you will find not so widely known free e-book library www.bookyards.com a valuable source in your search. They proclaim themselves as a “library to the world”, but against the grand proclamation, it has a modest collection of approximately 17, 000 downloadable e-books. It does not require any forms of registration for downloading e-books. And all the e-books are available in supported by Kindle .PDF format.
You can enjoy Grapes of Wrath by Steinbeck for free (compare to Amazon‘s $12.99); or Hemingway’s The Sun Always Rises ($11.99 on Amazon); F. Scott Fitzgerald’s The Great Gatsby ($10.99 on Amazon). However, I have to admit, Bookyards’ fiction section is quite limited.
This free e-book library is mostly education oriented. So, a student, or a researcher, or just a curious erudite might find this resource a very useful one. If you were looking for an electronic version of C. Bresciani Turroni’s Economic Policy For The Thinking Man, or perhaps the Marquis de Nadaillac’s Manners And Monuments Of Prehistoric Peoples, or Charles Marquis Smith’s Electric and Magnetic Measurements (all of which are unavailable in Kindle edition on Amazon) – then Bookyards will become your favorite source for e-books.
The organization of the site is pretty easy to navigate; all the available e-books are a couple clicks away from downloading. Also, Bookyards displays the list of the most popular downloaded e-books on the front page. To my giggly astonishment, one of the most downloaded books is not Adventures of Huckleberry Finn or The Kama Sutra of Vatsyayana (kudos to Project Gutenberg’s Top 100), but it is Sharipov’s Classical Electrodynamics! See? What an extremely different contingent of e-book users frequents Bookyards.
I hope you will find this library useful in your free e-book search.