What are some new/up and coming programming languages? Where did you find them?

Last week I found Ballerina (https://ballerina.io/) via a comment here on HN, which got me thinking that I've gotten a bit out of touch with newer/up and coming languages in development. My guess is that, if I missed Ballerina before a week ago, I've probably missed quite a bit more.

What have I missed? And it would be cool to see where people are finding these types of things too.