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JRuby - Java powered Ruby implementation
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"JRuby is an 100% pure-Java implementation of the Ruby programming language.
Features
 * A 1.8.6 compatible Ruby interpreter written in 100% pure Java
 * Most builtin Ruby classes provided
 * Support for interacting with and defining java classes from within ruby
 * Bean Scripting Framework (BSF) support
 * Distributed under a tri-license (CPL/GPL/LGPL)"

For more information:
http://jruby.codehaus.org/