The Weekly Squeak

Mondrian, by Tudor Girba, is simply a visualization tool. The cool thing about it is that it can be used to display graphs of any kind or size (classes with methods, methods invocations). Graph displaying may be obtained dinamically just by scripting the Mondrian engine, without ever manipulating the graphic engine: you just specify the nodes of your graph, how they should be connected, and how they should be laid out. A great tool, with many possible uses.