[jhallenworld]

Oh xfig is missing. I still use this awesome program for drawings. It's primitive but in many ways faster to use than inkscape.

[jordigh]

xfig also has one of the few implementations of x-splines (x means "cross" here, like "pedestrian xing", unrelated to the X window system). I find x-splines very nice and intuitive.

Here's a little x-spline implementation I made:

https://jordi.platinum.edu.pl/xsplines/splines.html