Open Source XML UI Toolkits in Java

WidgetServer is a Java/XML server-side GUI-framework which enables an application to run as either a monolithic Swing app, a client/server Swing app, or as a Web app without any change. It includes a mixed deployment mode, which supports one server to serve Swing clients and Web clients at the same time. The framework uses XML or a single java API to define an application's GUI independently from target client technology. It provides a common widget-based, object-oriented programming interface for Web and Swing GUIs, which prevents the developer from struggling with HTML and HTTP or with the internals of Swing. The project includes a GUI builder that is based on the framework's functionality.