[IntelliJ IDEA|http://www.intellij.com/idea/] is an IDE tool for java.
Available with commercial (license: US$499) and academic (US$100) licensing.\\
(Add $200 for extra support; not really necessary)

They also run a free EAP (Early Access Program) when they start working on a new version, where you can always use the latest and greatest version for free (until it's officially released).  They also sometimes run special deals where you can get a personal license for only $200, and the license allows you to install a copy at home and at work (I think). --KenLiu

;:One of the best ever, IMO.  Beautiful Swing interface, excellent refactoring support.  If only they could minimize garbage collection pauses somehow.  --KenLiu