We're building single-page web apps using Angular.js on one project I'm working on.
We've got devops scripts that are written in Ruby, though some are being ported to Java.
A featureful modern Lisp that runs on the JVM. Now where did I leave that parenthesis?
The premier, strongly-typed, pure functional language. And it has pattern matching.
An actor model, functional programming, and extremely lightweight threads. Who could ask for more?