SK Fractals produces a Mandelbrot fractal using Racket (formerly known as PLT Scheme).
This was mainly written to learn more about fractals and have fun.
You can find the latest version of SK Fractals here:
http://www.github.com/skangas/sk-fractals
Bug reports, comments, and suggestions are welcome! Send them to Stefan Kangas <stefankangas@gmail.com> or report them on GitHub.