JRuby - The Ruby Programming Language on the JVM

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JRuby is an implementation of the Ruby language using the JVM. It aims to be a complete, correct and fast implementation of Ruby, at the same time as providing powerful new features such as concurrency without a global-interpreter-lock, true parallelism, and tight integration to the Java language to allow you to use Java classes in your Ruby program and to allow JRuby to be embedded into a Java application.

http://www.jruby.org
https://github.com/jruby/jruby

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