Have you seen?: Discord Bot Construction Kit 🤖
It’s still under active development. Speaking to the developers recently the next version will be out “when it’s done”. Amongst other things they are working on Threading support.
These are the same thing. It’s just that the gem document only claims 3.4.0 as latest. The other is the official repo. If you click the Homepage link on your first link it takes you to your second link ;). I have no idea why the gem document does not list 3.4.1.
You can reference a GitHub repo if you really have to: rubygems - Install Gem from Github Branch? - Stack Overflow