Archive.org

Archive.org is best known as the place where you can pull up old versions of websites, so you can see content that has been removed. At least, that's what I always used it for.

But they also offer many audio files, including music and audiobooks. Here's the audiobook page. Unfortunately, some books are divided by chapter, and there's no one page that links to all the chapters. When you see a partial book, do a search for that title, then the search results will find the other chapters.

All recordings seem to be read by humans, not computers, as far as I can tell.