GTK+-DirectFB is a backend for GDK, the drawing kit used by GTK+. Since DirectFB provides drawing functions, a windowing stack, and manages input devices, this is a lightweight GDK port. GTK+-DirectFB is based on GTK+-2.0 and implements the drawing functionality encapsulated in GDK. It allows you to run standard GTK+-2.0 applications on the Linux framebuffer. Due to the use of DirectFB, graphic operations are hardware accelerated if a suitable DirectFB gfx driver is available. Since DirectFB is a very thin library, the memory footprint of GTK+-DirectFB is relatively small.
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.
KitClasses are a collection of add-on classes for KDE application development. The library consists of classes that range from simple sub-classed enhancements to complex, full-featured widgets. The goal of this project is to develop quality complex widgets that will easily plug-in to developers' applications.
The JOpenChart library and toolkit provides the means to create different kinds of charts, including pie charts, line charts, and plot charts. Furthermore, it contains components for embedding charts into Swing or Web applications. The library's Renderer Interface API makes it very easy to add new renderers for different chart types. Classes to interpolate measured data and to plot mathematical functions are also included.