IT Mill Toolkit is a server-side RIA (Rich Internet Application) library that provides a versatile set of AJAX widgets for Java programmers. Applications are programmed in Java and executed server-side. At the client-side (i.e. in the browser), enhanced GWT widgets are used for presentation.
Swing has lot of components built in, but still some are missing. This project provides the developer community with these missing components, inspired from modern user interfaces. It provides a PropertySheet component, a collapsible task pane (JTaskPane), a button bar (JButtonBar), a font chooser (JFontChooser), an Outlook Bar (JOutlookBar), a Tip Of The Day dialog (JTipOfTheDay), and a directory chooser (JDirectoryChooser).
Luxor is an open-source XML User Interface Language (XUL) toolkit in Java that lets you build UIs using XML and also includes an ultra light-weight, multi-threaded Web server, a portal engine, and a template engine. It is also Web Start-ready, as everything fits in a jar and requires no loose files.
Salsa is a collection of Swing add-ons. It includes new widgets such as auto-complete textboxes or tree tables, new data models such as XML tree models, UI tree models, or Java Bean table models, new common dialogs such as a font chooser, new convenience methods such as center frame on screen, and much more.