Is this really free software? I am really looking for _GOOD_ TTS software which is maintainable, really opensource (for every usage) and can do english/german/spanish/french/russian.
Zonos TTS is the SOTA, fully open-source (Apache license), and supports English, Japanese, Chinese, French, and German out of the box. You could train to add Russian, or run the output of this TTS through Meta's Seamless translation.