FractalWorks is a high performance fractal rendering application for Maces. It is multithreaded, and produces beautiful images. The program includes a variety of pre-defined "color schemes" which you can use to color your plots, as well as a color editor that lets you create your own color schemes or modify existing ones. Fractalworks also includes a wide variety of sample plots to get your creative juices flowing.
Mac OS X 10.6.6 or later