SuperWaba is a VM for PDAs. Because of the way it was written, you can use Java to develop programs for it. It supports exceptions, threads, many user interface controls, double and long 64-bit types, grayscale, color, 3D controls, and JNI and Java libraries, among other features. The project has been superseded and replaced with TotalCross.
XWidglets is a complete rich Java Swing tool for designing, creating, and using XML-based GUIs. It provides a lightweight XML client, clear separation between view, data, and process, MVC I and II support, event management, a consistent look and feel across platforms, a rich set of GUI components, and n-tier architecture integration.
Java Tiny Gfx Library (JTGL) is a graphic foundation framework (a graphics/gaming API) that will allow easy deployment/porting of applications/games on many environments: AWT, Swing, J2ME (MIDP 1&2, Nokia, and Siemens), SuperWaba (PalmOS, PPC, and Symbian), ExEn, DoJa, and others.
Light-Weight Visual Components Library (LwVCL) is a powerful, small, fast, efficient, framework of visual components that provides a rich set of customizable, flexible user interface components. There are versions for J2SE/J2ME Personal Profile, J2ME MIDP, .NET, and SWT. This provides a unified GUI framework for different platforms that provides the same API, the same concepts, and the same look and feel.
XUI is a Java and XML platform for building Rich Internet Applications. The platform greatly reduces the amount of code needed to build feature rich applications on a wide range of systems. The project includes plug-ins for both NetBeans and Eclipse, plus support for AWT, Swing, SWT, J#, and HTML.