IT-eye : "gDevelop adds a GWT design tab to the java source editor, which enables you to edit GWT panels like you would Swing panels."
Features:
  • Visually design your panels, composites, menus and other widget types
  • View, change your widget's properties using Property Inspector
  • Add event handlers to your widgets

gDevelop - Visual GWT editor plugin for JDeveloper
gDevelop