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Tablet Android pen-drawing app
(beehaw.org)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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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