If you follow this article https://blog.rasa.com/how-to-build-a-voice-assistant-with-open-source-rasa-and-mozilla-tools/
it will have you download an 80MB file from:
https://drive.google.com/drive/folders/1GU8WGix98WrR3ayjoiirmmbLUZzwg4n0
called best_model.pth.tar
and using https://github.com/mozilla/TTS
you get the "sara" voice (which is very impressive)
Are there other best_model.pth.tar files out there with other pre-trained voices? Similar to CSS themes where you can download some or free, for pay or a really good one, do we have a pre-trained TTS model directory somewhere?