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If you want to edit photos then Affinity is passable, and GIMP is a joke.
If all you want to do is draw, then Krita is a very capable alternative to Photoshop, but being good at only a specific subset of Photoshop capabilites doesn’t turn it into a replacement for it
I make my memes in gimp and it works for me.
Depends what you want to do to photos. It just adjustments without trickery, darktable is fantastic.