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InfluxDB
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Just to give a rough list though, here a few that I have tried: - espeak - Festival - flite - RHvoice - gTTS (it's good but uses an undocumented public Google Translate API) - tortoise-tts - silero-models
Check it out: https://github.com/Samyak2/gosling/ (also has audio examples).
https://github.com/synesthesiam/opentts is run through Docker, which is pretty simple, and provides a GUI in the browser. There is a good selection of voice engines and voices, and the local Web server has API endpoints. I've been using this on Linux Mint lately.
You can also run https://github.com/coqui-ai/TTS directly from the command line, and install it with Python pip3. Tip: set up a Python virtual environment for installing it first! Otherwise you might run into version conflicts. Otherwise, setup is very simple. This used to be Mozilla TTS.