Download JIG 1.4  
Release Features include Swing UI, browse compile and runtime errors, edit JSP.  Requires J2SE 1.4 JRE
Download JIG 1.3.1  
Release Features includes Dynamic Java, class file viewing and URL access to jars on the net.  Requires J2SE 1.3 JRE
JavaTM Integrated Development Environment
 
 

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JIG is a JavaTM integrated development environment that lets you write, manage and debug applets and applications written in Java. JIG is written entirely in Java. 

The JIG Browser provides a fine level of control and manipulation of Java source code elements and their relationships. The developer gains maximum access in complex domains through the use of source code browsers providing different views of the code, from the system, class and hierarchical level down to internal references and methods. The JIG Debugger implements the Java Platform Debugger Architecture and is integrated with the JIG Browser.