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FOSS Image editor
(discuss.tchncs.de)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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Seconding this.
Krita's made so much progress over the years. One of the best FOSS image tools. It might be intended for painting and artists, but it's just as good at regular image editing.
That's essentially the opposite path Photoshop took and that's considered good for both. Anyway can attest, krita works great for everything I've every used Photoshop for.