So I just tried @penpot with a very basic task that was frustrating in Krita*: namely, marking up photos of the windows in my new office with measurements to have blinds fitted.
And they are building a really nice tool. Shame about it being venture-capital funded but, idea for interested folks: keep an eye on it and fork if you smell an exit.
* Before anyone asks: I can’t use Inkscape or Gimp as they still don’t display correctly on my HiDPI screen so it’s a no-go from the start.
(It’s still very early. On Firefox, at least, I couldn’t get it to make shapes black for example or properly display shades; there was something wrong with the colour picker. But looks like a solid foundation.)