joachimreichel.de
This program generates fractal images such as Mandelbrot sets, inverse Mandelbrot sets and Julia sets. However, the main purpose of this software is not to generate nice fractal images. For this purpose there exist many much better suited software packages. I rather used this toy project to gain experience in various languages and tools.
Mandelbrot setThe Mandelbrot set is a set of points in the complex plane with a fractal boundary. It consists of the set of complex points $c$ for which the orbit of $z_0=0$ under the complex iteration formula $z_{n+1} = z_n^2 + c$ remains bounded. 

Julia setThe Julia set is the boundary of the set of complex points $z_0$ for which the orbit of a fixed point $c$ under the complex iteration formula $z_{n+1} = z_n^2 + c$ remains bounded. 