No, not much. I use GIMP and Inkscape occasionally for simple things like quick and dirty mock-ups, changing backgrounds, and adding transparency. They’re good enough for that. I’d bet a professional could learn to become efficient at using GIMP, but I don’t think it’s as intuitive or feature-rich as Photoshop.
People Aren't Happy With Adobe's Spyware-Like TOS Update: Users of Photoshop, Substance 3D, and other Adobe products are now required to provide the company with unlimited access to their projects. (80.lv)