Jazz is a toolkit that supports the development of 2D structured graphics programs, in general, and Zoomable User Interfaces (ZUIs), in particular. A ZUI is a new kind of interface that presents a huge canvas of information on a traditional computer display by letting the user smoothly zoom in, to get more detailed information, and zoom out for an overview. We use a "scene-graph" model that is common to 3D environments.
Get Jazz here
You can also try out a little TV interface I designed for a user interface class in grad school. The interface was required to run at a resolution of 640x480 and could only use a 5 button remote. You can get the source code if you're interested. The source code requires the latest version of Jazz available from HCIL. This was a team project with 2 other students under the usual limited time constraints.