JRuby, an implementation of Ruby on the JVM

JRuby's native launcher executable

Rack for JRuby and Java appservers

The JRuby.org site

Warbler chirpily constructs .war files of your Ruby applications.

maven plugin to handle rubygems in a maven way. including support for rspec, rails, cucumber, rake, etc

bundler support for jars for jruby

ruby helpers for maven related tasks

JRuby's ActiveRecord adapter using JDBC.