4. Erlang 

Worth - $107,000

Erlang is a very old computer programming which supports applications in demanding can't-go-down environments like e-commerce apps.

It was released in 1998 as an open source language and its popularity grew from there.  Since technologies like cloud computing and big data are growing rapidly, Erlang is making a come back, since it is good for tasks that require dealing with a lot of spread-out systems that can't go down.

3. Clojure

Worth - $108,000

Clojure is a modern version of a very old computer language known as Lisp which hails from 1958. Invented in 2007 by Rich Hickey, it became popular because it works with the Java Virtual Machine, used by web browsers. It is a functional general-purpose language that runs on the Java Virtual Machine, Common Language Runtime, and JavaScript engines. It's good for writing really complicated web apps that support lots of concurrent users.