KittenTTS nano 0.8 (int8): Apache-2.0, https://huggingface.co/KittenML/kitten-tts-nano-0.8-int8
onnxruntime-web: MIT, https://github.com/microsoft/onnxruntime
phonemizer (eSpeak NG compiled to WebAssembly): eSpeak NG is GPL-3.0, https://github.com/espeak-ng/espeak-ng