AFAIk yes. With GOG you get your installers and everything and you run them / install them without any additional client just as any app on your system. It's why I've been buying games there more than on Steam
Downloading a game without DRM (versus one with steam's DRM) doesn't mean you have the right to copy and redistribute that game all you want - with GOG you still only get a license to play the game and can't redistribute or sell it to anyone else.
I know that. But even if GOG goes bankrupt tomorrow I still have all my games and installers on my drive and can play them anytime. I can't say the same thing for Steam.
