A new public beta of the newly revived wxRuby3 has been released.
If you are interested check this out:
Release info:
https://github.com/mcorino/wxRuby3/releases/tag/v0.9.0-beta.11
Github:
https://github.com/mcorino/wxruby3
Rubygems:
https://rubygems.org/gems/wxruby3