The first place we would suggest going to for free Kindle books is straight to the source – Amazon. Here you’ll find hundreds of free ebooks (.azw files) that can be downloaded and sent straight to your Kindle.
The right hand column lists the top 100 free Kindle books in order of popularity. You can also browse Amazon’s limited-time free Kindle books to find out what books are free right now and you can sort this list by popularity, review, and publication date.
You will find books like:
The Holy Bible, English Standard Version (with Cross-References)
Autobiography of a Yogi
What Is HTML5?
Colters’ Wife
Slow Ride (Rough Riders)
There are many more sources available on the internet from where you can download free books for Amazon Kindle but we would only recommend the official Amazon site.