PyMandelbrot is a project mainly written in Python, it's free.
Render the Mandelbrot set with smooth colours in Python
pyMandelbrot renders the Mandelbrot Set in full glorious color. To render images, it uses the pyPng library which is included for ease of use (png.py).
The program has several different options to control how the set is rendered, it takes as input:
The program will then save a PNG file to the location you specified.