If you're looking for other languages, Piper has been around in this scene for much longer and they have open-source training code and a lot of models (they're ~60MB instead of 25MB but whatever...) https://huggingface.co/rhasspy/piper-voices/tree/main
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you need api key and internet access to run locally? lol. Classic .NET project.
Yeah, they're just spamming the threads at the moment with their commercial product.