I've been working for a while now on a high performance fractal rendering program for Macintosh computers. It's main features are its speed, its unique take on coloring, and its ability to create striking looking 3D images. Here are some samples of 3D fractal images I've created.
The program uses distance estimate data (based on the derivative of the iterated function) to create a height map, and then renders that height map as a colored and shaded 3D image.
Some sample images: (click each image to see a larger version on my pbase site)
Julia snowflake 3D:
Mandelbrot flower:
And a fractal mountain landscape:
If you have a Macintosh computer running OS 10.4 or later you can try the program yourself. There is a link at the top of <u>my pbase gallery</u>. (link)