Text to Speech Software in Rust
eSpeak Bindings for Rust
The best open source tool I can find for text-to-speech so far is the eSpeak tool. There are also Rust bindings for eSpeak which I haven't had the chance to try out.
Best overall Text to Speech
The best open source text to speech library that I know of is Tensor Flow TTS. Maybe that could use some Rust bindings.