I have never played with GNUStep. By the time I actually started real work as a professional software person (2011) it was already kind of considered a joke, so I never bothered learning how to use it.
It bothers me a bit, though. Developing for desktop Linux is still a pain in the ass, and I really wish the Linux community had agreed on One Desktop Framework To Rule Them All, and I think GNUStep could have been that framework if the community had been willing to embrace it.
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