Frozen Fractals

Frozen Fractals is a free program which creates snowflake fractals based on replacement of a straight line with a more complex figure. It consists of a fractal interpreter and a user interface, both of which can be downloaded here:

Fractal Interpreter
User Interface

It is possible to use the fractal interpreter without the user interface, but the user interface requires the interpreter. Running these programs requires Python, which is available for all major platforms. Python 2 is required for the moment, rather than Python 3.
Fractals are expressed using a simple fractal description language. Here are some examples.
IMAGINE workshop pictures