L-System
Space-filling curves, fractals and plants from string-rewriting turtle graphics.
Pens
Colors follow branch depth, or progress along an unbranched curve. Starts with 4 pens and works with anywhere from 1 to 8.
Settings
Preset, Iterations (0 = auto), Axiom, Rules, Angle°, Corner rounding, Angle tweak°, Angle jitter°.
The preview uses the default settings on A4. Press R in the app for random variations. The SVG export is in millimetres with one Inkscape layer per pen, so it works with the AxiDraw extension, vpype and saxi.