Ruby and JRuby
Ruby is a dynamic, open source programming language with a focus on simplicity and productivity. It has an elegant syntax that is natural to read and easy to write.
JRuby is an implementation of the Ruby programming language atop the Java Virtual Machine (JVM).
I’ve used JRuby as a convenient way to deploy work in a Java-centric environment, and to leverage the huge number of existing Java libraries whilst keeping my code in Ruby.