JRuby stack: 1.7.5. For those of you who may not be familiar with the project, JRuby is a 100% Java implementation of the Ruby programming language. It is Ruby for the JVM. JRuby provides a complete set of core “builtin” classes and syntax for the Ruby language, as well as most of the Ruby Standard Libraries.
The goal of JRuby 1.7 point releases is to fill out any missing compatibility issues with Ruby 1.9.3. This version fixed a number of issues related to compatibility and performance. You can find the list of the bugs fixed and new features here.
BitNami JRuby stack is a free self-contained package that simplifies the development and deployment of JRuby applications. This version includes ready-to-run versions of Java 1.7.0_40, Apache Tomcat 7.0.42, MySQL 5.5.32, JRuby 1.7.5 and all required dependencies.
It can be deployed using all-in-one free native installers (for Windows, Linux and Mac OS X), virtual machines and Cloud Images. Check it out!