An open source [Java] IDE formerly owned by IBM. It is written in SWT which provides a faster native GUI than other Java IDEs like NetBeans and JBuilder. Its refactoring utilitiy is superior among other IDEs as well. 

It has many plug-ins available for free download or buy, for different purposes from Swing/SWT GUI building to UML modeling, for example [SWT GUI Builder|http://www.swtguibuilder.com/index.htm], [JBeaver Swing GUI Builder|http://www.ratundtat.com/index01.htm?menue=40], [SDE for Eclipse|SmartDevelopmentEnvironment].

Homepage [http://www.eclipse.org/]