There is a lot of interesting things going on in the Ruby world. One of the more interesting aspects of Sun’s stewardship of Java was the encouragement of alternative languages to use the JVM as a platform. One language, JRuby, is a Ruby-based implementation. It has made considerable progress over the past few years. The head architects of the language Charles Nutter and Thomas Enebo spoke a RubyKaigi 2013 on JRuby's future.