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Affinity’s Adobe-rivaling creative suite is now free for six months
(www.theverge.com)
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.