image generator based on context-free grammars

 Context Free is a program that produces images based on context-free grammars.
 These grammars are sets of non-deterministic rules that determine what an
 image should look like. The resulting images often resemble a mix of
 spirograph drawings, fractals and abstract art.
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 Context Free can generate images with millions of shapes, in PNG (up to 100
 megapixels) or SVG format. It can also produce animations. Many example
 images are included.