Vara

Drawing and digital painting application with pressure-sensitive brushes.
It belongs to the group of applications like Krita and MyPaint, but with
a limited number of features. The main focus is on simplicity.

CAREFUL: In some older versions of Vara, when run inside a sandbox like Snap, the file is not saved if .png extension is not manually appended; so make sure to give names that end with ".png" while exporting.