Possibly controversial opinion, but I think UI in most open-source software needs a lot of work. GIMP is one such example of it. Good programmers aren't necessa

Possibly controversial opinion, but I think UI in most open-source software needs a lot of work. GIMP is one such example of it. Good programmers aren't necessarily good UI designers. For vector graphics, I use Inkscape for SVG editing and retouching, though. It is at least bearable to use for me. This might be more due to my experience as a programmer, but I see the most success in creating good UIs in open-source code editors. Perhaps because as programmers, they are already better at judging what kind of things work and don't work for UI and UX in this kind of software, compared to digital paint tools, 3D modeling, etc.