Mandelbrot Drummer is a MIDI drum sequencer for Windows that is designed to create rhythms based on fractals:
Mandelbrot Drummer is a new way of creating rhythm patterns for your music. It uses the mathematics of the Mandelbrot fractal set to mimic the subtlety of feel of a human drummer. The program generates drum sequences automatically so you don’t have to individually adjust each MIDI event in a piano roll editor.
Mandelbrot Drummer for Windows is available now for US $15. A demo version is available.
Here’s another example, a 5/4 rhythm created with Mandelbrot Drummer.