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This is a most excellent place for technology news and articles.
PhotoGIMP should work if you want a more Photoshop-y feel, though it's not a plugin, it's config file changes
https://github.com/Diolinux/PhotoGIMP
Damn you. Now I gotta check that out. I dropped gimp permanently once I tried Krita.
I don't remember the names of the ones I used, but there are a ton of tutorials and videos on how to set it up to look like Photoshop, or in my case Fractal Design Painter