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Reason I use paint.net, It's small and portable in size.Can be installed at any computer without much hassle, it has a decent amount of tools which gets the job (my job) done. I love the gui, same as PS (yes I know)

Call me cheap but I prefer opensource/apps that are small in size rather than having a piece of software which I wouldn't even use 90% of all available features (I think I got that right?)