JMRI: Building with JBuilderJBuilder is a viable platform for developing and debugging JMRI code. JBuilder extends the Eclipse open source framework and can be downloaded for free. However many developers would recommend using NetBeans, XCode, Eclipse, or even just bare Ant.
A free download trial copy of JBuilder is available from http://www.embarcadero.com/products/jbuilder.
After downloading and activating your copy of JBuilder you can use the directions from the Eclipse installation to configure JBuilder.