Almost a year on - what better tribute to Benoit Mandlelbrot than the XaoS
realtime fractal zoomer?
This can zoom in and explore various kinds of fractals (including Mandelbrot by default) in breathtaking smoothness and detail, particularly for those used to old-school Amiga fractal generators (which were pretty good back then too).
As well as working on MS Windows, Mac OS X, Linux and BSD, there is also a version included with AROS. I like this software a lot.