So I'm curious, this presumably needs DRM free ebooks to begin with right? Chances are if you have those you have a line on audio books as well. Is this intended for the books that just aren't available as audio books yet?
If you are visually impaired you can get free audio books from The Braille Institute.
Yes. A previous version. It works pretty well for books you don't need voice actors. If all you need is a reading voice, this will work relatively well. Just... don't be me, and actual read the docs.
Dang I wish did more with the Mimic3 project. They have SSML support which just seems like an awesome way to address the mono voice issue in tts for books to me.