I don’t think I’ve ever downloaded a free Kindle book from Amazon, but I’ve seen some of my Facebook friends mention that they regularly read free Kindle books. I recently received a tip through my contact form, suggesting a site that lists over 33,000 free Kindle books.

The site, Freebook Sifter, categorizes the books by genre, and by fiction and nonfiction, and let’s your organize the books by number of ratings or average stars. With a glance at the site’s sidebar, you can get an idea how many books are available in each category. For example, at the time of this writing, there are 3757 books in the history category, and only 61 in the humor category.

Bobby Travis previously wrote about eReaderIQ, another site that lets you find free Kindle books. Freebook Sifter is a bit more utilitarian than eReaderIQ, which, as Bobby noted, has a busy interface. I also previously wrote about a lending service, the Kindle Lending Club (now rebranded as Booklending.com), and a reader, Peter Tompson, pointed out another service, LendInk.

So there are four possibilities for you – Freebook Sifter, eReaderIQ, Booklending.com, and LendInk. If you know of any other places to find free books, let me know in the comments.