Clojure
Clojure is a dynamically-typed, functional programming language that runs on the Java Virtual Machine (JVM). It is used for developing scalable and concurrent applications, with a focus on simplicity, immutability, and code-as-data philosophy.
Hello, world code example:
(println "Hello world!")
Popularity: 1.27% of developers are using or have used this language.*
*According to StackOverflow's 2023 survey.
Repositories on GitHub: 87,098