Diesel eBooks has thousands of books available for sale, but they also have a selection of free ebook downloads. After you have hit their website, click on the “Download Free eBooks” link. The Diesel Gratis Collection includes classic American and British fiction, American history, children’s literature, Shakespeare, African-American documents, and much more. For your Kindle, make sure you select the “Mobipocket: option. Diesel eBooks is currently offering free ebooks from over 413 authors with over 750+ titles.