http://aleph0.clarku.edu/~djoyce/julia/explorer.html
The Julia and Mandelbrot Explorer offers visitors a fractal rendering engine. Users are presented with a default fractal image of a Mandelbrot Set. By clicking on various parts of the fractal, users can zoom in on the Set and view the fractal images in greater and greater detail. There are also several options that the user can set, such as color or black and white images, and a collection of recently generated fractal images.