Depends on how you define "good". Espeak-ng, for example, works just fine as such. But the quality of the freely available voices is nothing close to the Siri /

Depends on how you define "good". Espeak-ng, for example, works just fine as such. But the quality of the freely available voices is nothing close to the Siri / Google Assistant / Alexa / whatever standard. Understandable? Yes. Usable? Yes. But "good"? Mmmmm... YMMV.