Xom (Xml Object Model) is a lightweight, powerful, and extensible framework for representing Java gui elements. Also, general java gui tools/frameworks for creating impressive user interfaces. Includes a basic PDF viewer, and various gui components.
AsWing is an ActionScript GUI framework and library that let programmer make their flash application(or RIA) UI easily, its usage is similar to Java Swing(JFC). It provides a set of GUI components with a pluggable look and feel and utility classes.
JavaPepper is a lightweight non-JSP,non-marked up HTML based Java web framework intended for Java programmers. It contains a number of standard web widgets, but can be extended to include custom web widgets.
Java Gui Designer(JGuiD)is a graphical user interface designer for java with a special feature WYSIWYG(what you see is what you get).you will be able to see at design time, the exact same thing as you get when thegenerated source is executed.
Xml java Gui Builder is a swing's components builder using SpringLayout and runtime xml file.
The Java MultiMethod Framework is a pure Java packagethat permit to deal with multimethod in Java.
Java Open Framework (JOF) is a suite of applications extending your creative potential. JOF includes a HTML creator, image editor, text editor and an audio/visual player and converter.
Legaya is a Microsoft DirectX 9 compatible GUI framework for games and/or media applications. It contains a small garbage collector for unused controls and is highly flexible in event management.
AJAF (A Java AJAX Framework) is a very light weight engine that assists developers in a) AJAX communication between browser and server and b) HTML rendering to achieve partial page refreshes.