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JRuby x64 is a 100% Java implementation of the Ruby programming language. It is Ruby for the JVM.

JRuby provides a complete set of core "builtin" classes and syntax for the Ruby language, as well as most of the Ruby Standard Libraries. The standard libraries are mostly Ruby's own complement of .rb files, but a few that depend on C language-based extensions have been reimplemented. Some are still missing, but we hope to implement as many as is feasible.

JRuby is a very practical answer for developers and project managers within non-IT companies who want to get higher productivity on a broad swath of their projects and move toward a next-generation rapid application development tool without throwing away existing Java investments,