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Tablet Android pen-drawing app
(beehaw.org)
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Krita I don't draw so can't talk about the experience of using it
Krita doesn't have an Android app version though, does it?
Krita (Professionelles Malprogramm) https://f-droid.org/packages/org.krita/
I think they're looking for a new maintainer for the Android version, hopefully they'll find one but don't depend on it too much