Mandplot
From Theory of Measurements Wiki
A small program for studying and visualizing complex valued attractors in the Mandelbrot set. Here are some examples done with the program Source:
Complex attracting regions visualized by showing the complex path of recursion.
Density resulting from all points traversed during recursion, when constructing the Mandelbrot set.
I think I've seen this one somewhere before. In log intensity to give better details:






