Over the years, Amazon has made it very simple to read Kindle Books. Just download the free reading app. which is available for PC, MAC, iOS, Android, and Windows phone. Download your free app here:
Since Kindle is so widely available, free Kindle books are very common. Please use this thread to post any free books you come across.
Also, don't forgot to share this post with your friends and family, if you find any of the books to be of interest to them.