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Also very curious about this. I’ve been slowly building one myself and would happily give up if another good one already exists. Tried searching the web and can’t find it.

There was a CDClabs github version and the Frank/STEPS code. Contact me, its burried in my 20 TB archive.

CDG Labs. But this is not it: <https://github.com/cdglabs/sketchpad14>

Source code: <https://github.com/alexwarth/sutherland>

Demo: <https://alexwarth.github.io/sutherland/>

The demo itself is a video of this: https://youtu.be/Vt8jyPqsmxE?t=750 which is a simulation done in the Frank system in the STEPS project.

Ivan Sutherlands sketch pad paper is here: https://dspace.mit.edu/handle/1721.1/14979