Depends how small or complex you want a TTS, as flite + flitevox voice packages worked on pi or zynq ARM cpu just fine. =3 Also: https://github.com/sparkaudio

Depends how small or complex you want a TTS, as flite + flitevox voice packages worked on pi or zynq ARM cpu just fine. =3 Also: https://github.com/sparkaudio/spark-tts https://github.com/sparkaudio/spark-tts