Text to speech software recommendations?

There is an alternative to generating text to speech as audio files, that is using inbuilt browser text to speech in HTML5 compatible browsers, most people aren't even aware of this capability yet. We've built an add-on for SL that does this very easily, when you change the text on a slide the text to speech instantly updates also. There are no audio files transmitted/downloaded so there is zero bandwidth too.

The quality is great as it uses voices from Chrome and Safari and fallsback to online services for other browsers. Builtin text to speech is built into Android and iOS making mobile delivery very powerful too.

There is a free trial, but if you need any assistance making your project run using HTML5 responsivevoice message me directly and I'll give you a hand.