What's the best text to speech software these days?
There are online TTS services, Amazon Polly and Microsoft Azure both of which offer AI based Neural Net translation as well as the standard TTS. I have used them and they are very good indeed.
You can send files to them and they will process for free but may knock you off the queue if they are very busy or if you send them too much in one go so it is better to split your book into chapters and queue them up.
It takes about 4 hours for them to fully process a typical book, what they send back is an mp3. The voice quality, phrasing etc is extremely natural and can fool a lot of people.
There are different ways of accessing the services but I have found the easiest way is to use Balabolka, select the "Use Online Services" function and create a queue by pasting in each of the books chapters, one after the other, press submit then go and do something else for 4 hours.
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