The list of frameworks that are offered by the Eclipse development platform would take
several books to enumerate throughly. However, in addition to decorators and job support, let me
list a few that are extremely useful for application development.
JFace provides a wizard framework that makes defining wizards a snap. Swing provides
no such framework.
Eclipse provides a framework for adding markers to any disk-based resource. Markers
include a description and, optionally, locational information within the resource. Again,
Swing provides no such framework.
The Eclipse platform provides a robust preferences framework. Sure we have
java.util.prefs,
but that only takes care of backend storage, not front display and modification of the
values. With Swing, you would be left to code the front-end for user-configurable
preferences yourself.
The Eclipse help system is fully integrated with the plugin architecture of the
platform. Plugins can contribute help to specific topics within the help system.
A full featured status bar is standard issue with Eclipse-based applications. With
Swing, you have to roll your own.

Trashes Swing

Swing vs. SWT?