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Didn't upload this before so I'm doing it now... An icon I made for Xoral of their awesome character<3
There is also Gimp.
Gimp is mostly just for photo-editing, which makes it a pretty good stand-in for Photoshop if you only want to edit photos.
You can also do some digital art, although this is not Gimps forte. Much of my old digital art comes from my time with gimp.