JRuby, an implementation of Ruby on the JVM
http://www.jruby.org
1.7 branch: 
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.
You can use JRuby simply as a faster version of Ruby, you can use it to run Ruby on the JVM and access powerful JVM libraries such as highly tuned concurrency primitives, you can use it to embed Ruby as a scripting language in your Java program, or many other possibilites.
We're a welcoming community - you can talk to us on #jruby on Freenode. There are core team members in the EU and US time zones.
Visit the JRuby website and the JRuby wiki for more information.
Your operating system may provide a JRE and JRuby in a package manager, but you may find that this version is very old.
An alternative is to use one of the Ruby version managers.
For
We recommend always selecting the latest version of JRuby from the list. The you can install that particular version (9.1.10.0 is just for illustration):
JRuby uses code generously shared by the creator of the Ruby language, Yukihiro Matsumoto matz@netlab.co.jp.
Project Contact: Thomas E Enebo tom.enebo@gmail.com
from https://github.com/jruby/jruby
JRuby - an implementation of the Ruby language on the JVM
Master:
1.7 branch: 
About
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.
You can use JRuby simply as a faster version of Ruby, you can use it to run Ruby on the JVM and access powerful JVM libraries such as highly tuned concurrency primitives, you can use it to embed Ruby as a scripting language in your Java program, or many other possibilites.
We're a welcoming community - you can talk to us on #jruby on Freenode. There are core team members in the EU and US time zones.
Visit the JRuby website and the JRuby wiki for more information.
Getting JRuby
To run JRuby you will need a JRE (the JVM runtime environment) version 7 or higher.Your operating system may provide a JRE and JRuby in a package manager, but you may find that this version is very old.
An alternative is to use one of the Ruby version managers.
For
rbenv you will need the
ruby-build plugin. You may find that your system
package manager can provide these. To see which versions of JRuby are available you should run:$ rbenv install jruby
We recommend always selecting the latest version of JRuby from the list. The you can install that particular version (9.1.10.0 is just for illustration):
$ rbenv install jruby-9.1.10.0
rvm you can simply do:$ rvm install jruby
Building JRuby from source
See BUILDING for information about prerequisites, how to compile JRuby from source and how to test it.Authors
Stefan Matthias Aust, Anders Bengtsson, Geert Bevin, Ola Bini, Piergiuliano Bossi, Johannes Brodwall, Rocky Burt, Paul Butcher, Benoit Cerrina, Wyss Clemens, David Corbin, Benoit Daloze, Thomas E Enebo, Robert Feldt, Chad Fowler, Russ Freeman, Joey Gibson, Kiel Hodges, Xandy Johnson, Kelvin Liu, Kevin Menard, Alan Moore, Akinori Musha, Charles Nutter, Takashi Okamoto, Jan Arne Petersen, Tobias Reif, David Saff, Subramanya Sastry, Chris Seaton, Nick Sieger, Ed Sinjiashvili, Vladimir Sizikov, Daiki Ueno, Matthias Veit, Jason Voegele, Sergey Yevtushenko, Robert Yokota, and many gracious contributors from the community.JRuby uses code generously shared by the creator of the Ruby language, Yukihiro Matsumoto matz@netlab.co.jp.
Project Contact: Thomas E Enebo tom.enebo@gmail.com
from https://github.com/jruby/jruby
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