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I had similar question when I was reading the GIMP 3.0 thread the other day. Are there any legal issues, if someone made Open Source CAD that has a 99.999% similar UI to AutoCAD or in GIMP's case Photoshop?

That was DraftSight. https://www.draftsight.com/

How is it an AutoCAD 2000 clone if it's 2D only? AutoCAD could do 3D really well in the 90s if not earlier... (not parametric, but still)

Well it's released in 1999 and it is still actively maintained. It's awesome to see a long time commitment.

It is. But I was amused when I encountered it and saw that it repeated design decisions made to cram AutoCAD into a DOS machine. Do they still have "redraw" and "regen?"?

Not sure this is what you are looking for, but there is. I have never used this though: https://qcad.org/doc/qcad/2.2/reference/en/chapter11.html

Yes. I use qcad/librecad very infrequently.

But I used it for the first time for a renovation of my apartment in 2004 and it isjust great that when I was discussing a renovation with a neighbor I could still use it with the old files.