Where Can I Find Free Software for Caustics/Cusps?

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dmacbeath
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Hello folks, I'm looking for a free programme to play with caustics/cusps.
Does anyone know where I can find one? If not does anyone have any suggestions as to how to write a script
for one in gfortran?
Preferably all I'm after is a way to make quick plots of cusps in 2D.

Cheers and thanks a bunch.
 
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