The various distributions and their components are as follows:
Sun GlassFish Enterprise Server - Includes the application server software, HTTP load balancer, Java DB, and Message Queue 4.1. Enterprise Server is available from http://www.sun.com/download as a file-based installer, which offers both graphic and command-line modes for installation. JDK 1.5.0_14 is bundled with the file-based installer for Enterprise Server.
GlassFish: Open source implementation of Sun GlassFish Enterprise Server. This distribution is available as a JAR file from https://glassfish.dev.java.net/public/downloadsindex.html and includes an Ant distribution that has been extended with tasks to facilitate developing applications.