Deep Mandelbrot is a small command line utility to compute pretty pictures (or movies) of any size and depth of the famous Mandelbrot set and its surroundings. The most important features are: multi-threaded computation to support modern multi-core CPUs efficiently; arbitrary precision computations (using libgmp, so only your hardware is the limit); normalized iteration count to achieve continuous coloring (and to avoid color bands); image oversampling to enhance the quality of the resulting PNG image; many selected color tables and the ability to re-color an already computed data frame; an optional histogram as a table for further analysis (e. g. with Octave or Matlab) plus chosen 'color table vs histogram' as another PNG image; and support for easy movie creation.
Zowie.Fractals is a plugin for the popular Eclipse IDE that lets the user explore the set of complex numbers in the Mandelbrot set. When rendered visually, these can be quite distracting, and even pretty. It features intuitive mouse usage, the ability to load and save your work as PNG files, the ability to change the number of iterations, and full editor history integration.