The NetBeans IDE allows you to create, assemble, and debug code from a single, easy-to-use interface. The GlassFish edition of the GlassFish Server is bundled with the NetBeans 6.1 IDE. To download the NetBeans IDE, see http://www.netbeans.org. This site also provides documentation on how to use the NetBeans IDE with the bundled GlassFish edition of the GlassFish Server.
You can also use the GlassFish Server with the Java Studio Enterprise software, which is built on the NetBeans IDE. For more information, see http://developers.sun.com/jsenterprise/.