... Cocoa. Back then, the seed of today’s Cocoa was a part of NeXTStep, the OS that was the core of the NeXT computers. NeXTStep was years ahead of its time, and, while the lab full of NeXT workstations ... along the way. Best of all, you get to poke holes in the text and code, kibitz and generally make random suggestions. And then you don’t actually have to do the work involved in fixing it! And ... NeXTStep AppKit, the application building tools developed for the NeXT platform. When Apple bought NeXT in 1996, they began building a new version of the Mac OS, what we now know as Mac OS X, ...