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What non-FOSS software have you been unable to quit?
(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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Clip Studio Paint IIt was way ahead than any commercial or FOSS alternative. Especially if you're illustrator or comic artist working in specialized workflow (East Asia and SEA industry).
Tried Krita back then, but still lacks a lot of major important feature and customizable UI layout.