Is MaryTTS still as good as it gets for free TTS? I've been researching this topic and it seems like there are some open-source implementations of Tacotron, but the quality isn't necessarily great.
The nvidia tacotron implementation was much better out of the box than the wav in the neighbor thread.
with ssml formatting it is good enough for a customer facing ivr, though clearly recognizable as robotic voice - if this should be an issue i would not recommend it