I thought they were different tools. GIMP == Photoshop, Krita == Illustrator.

Krita defaults to a "Paint Layer" behaving very like Photoshop; it can also add "Vector Layers" that behave like Illustrator. I think it is fair to say it replaces both for a lot of use cases. GIMP is much closer to just Photoshop (and say Inkscape is much more only Illustrator).

Interesting! I'll have to check it out.

Krita is a close second to Blender in terms of well-run creative FOSS projects. Would love to see more projects take their approach.