Clojure and Scala are pretty good ideas, being modified versions of two leading programming paradigms, i.e. Lisp and Haskell respectively. Groovy is the most JR

Clojure and Scala are pretty good ideas, being modified versions of two leading programming paradigms, i.e. Lisp and Haskell respectively. Groovy is the most JRuby-like of those choices, and probably has far more traction than JRuby because it uses Java syntax and is more heavily promoted.