Drawn with Linux MyPaint and GIMP. As noted previously, if you use the "pencil" tool in GIMP it doesn't anti-alias. Interestingly you can stay in pencil mode and use some of the other brushes, which behave kind of like pixel art. This pile is a tangle of brush experiments, as well as some things you can do with tinting layers via airbrush (in non-pencil mode).