Xcode is the Apple's free development IDE as of OS X 10.3.  It is primarily an objective-C IDE, but  offers Java development support, including optional support doing J2EE development with JBoss, Ant and XDoclet.

If your JBoss install fails after upgrading to Java 1.4.2 on OS X, see KB 107814 for details on fixing it or download the update.

Related:

• Apple's Xcode page - http://www.apple.com/macosx/features/xcode/

• Why use Xcode for JBoss development - WhyXcode