ChatTTS

ChatTTS turns text into spoken dialogue in English and Chinese. It is a free, open source text-to-speech tool built around conversational speech, so the output sounds more like someone talking than someone reading a script.

You get fine-grained control over prosody, which covers things like rhythm and intonation, and that is where ChatTTS separates itself from plain voice generators.

The aim is natural, expressive delivery rather than a flat read-out.

You can use ChatTTS online without installing anything or owning special hardware, and free trials are available.

It is mainly built for non-professionals, so expect a simple way to produce dialogue audio rather than a studio production suite.

Only English and Chinese are supported, which will rule it out if you need other languages.

Use of the project is at your own risk, which is worth keeping in mind before you put it into anything public-facing.