This document provides instructions and links for installing the necessary software for a JRuby on Rails tutorial, including the Java Development Kit (JDK), MySQL, GlassFish, and JRuby. The JDK 6 update 13 is the preferred version, with JDK 5 as the minimum. Links are included for downloading the JDK for Linux, OS X, and Windows systems, as well as for MySQL, GlassFish, and JRuby.