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Open-source speech recognition and text-to-speech : https://forum.poppy-project.org/t/open-source-speech-recognition-and-text-to-speech-potentially-usable-with-the-poppy-robots/445

text to speech: http://mary.dfki.de/ and http://mary.dfki.de:59125/ and https://github.com/marytts/marytts

We implemented a system using MaryTTS