BitNami JRubyStack provides a fast, easy way to develop and deploy Ruby on Rails applications on a Java runtime using JRuby. It includes JRuby, Rails, Java, Tomcat, the GlassFish gem, MySQL, and Subversion. It supports Windows, Linux, and Mac OS X, so you can share the same Rails environment on multiple platforms.
GlassFish Tools Bundle for Eclipse is an Eclipse distribution containing Eclipse Java EE 6 tooling. GlassFish 3 Java EE 6 is preconfigured, and optionally a JDK 1.6 all-in-one single installer is provided for XP, Mac OS X, OpenSolaris, or Linux. The GlassFish plugin for Eclipse provides the Application Server WTP adapter to enable Java EE development.