Rust "Iced" is a nice little UI library which I'm gonna probably use for personal apps. Currently doesn't have much accessibility support at all, but its something they're aware of.
Yeah, been wanting to try this out for some programming language environment stuff - currently doesn't support font fallbacks though, which is a tad annoying if you want some fancy maths symbols :)
Druid is another cool project https://github.com/xi-editor/druid/… - but Iced seems to have better support for embedding in games and websites (which I care about).