I use mostly hand-written postscript for CPs. It is perfectly suited to diagrams that require precise mathematical constructs and rotational symmetry. It produces crisp scalable vector graphics that are easily converted into PDFs. Best of all it is free and requires only a (free) text editor and free Ghostscript to view and convert to PDF. Does anyone else here use it?
I occasionally use AutoCAD to modify other people's existing CPs.
Your favorite diagramming software
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