[JadeNB]

With macOS making it harder and harder to run X11 programs—I don't even know how, these days—is there anything that allows you to run an Xfig-alike on macOS? (I've seen recommendations for Inkscape, and I'll give it a try, but I was really practiced with Xfig and would like to be able to draw on that muscle memory if possible.)

[eschaton]

XQuartz still exists and is still being updated, and you can either download and install it via an installer or install it via a package manager like MacPorts or Homebrew. It works just fine.

Things aren’t any harder now than they were when X11 was first unbundled and became XQuartz.