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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.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
GIMP does just about everything you could ever need except basic shapes.
And color management. Useless for photo editing, stuck with 8-bit sRGB.