I was going to ask, why hasn't anyone ported NeXTSTEP to modern architectures? It was a pretty decent windowing system. Then I realized duh that's what Apple did with OS X. Too bad they ruined it.
Is there something I'm missing/something specific you're talking about?
I'd say there were 3 distinct abstractions within NextSTEP: - The microkernel / OS (Mach / BSD) (for the hardware) - The Objective C based SDK - The User experience (not just window manager, but largely the window manager)
The SDK is what is still arguably the most highly regarded part of NeXTSTEP even today. That aside, at the time nothing else was so well polished and integrated on almost every level.
NeXTSTEP (carried on with OS X), NeWS, Irix are kind the exception on UNIX land.
There is a vertical integration from kernel to application programming and user desktop, alongside its hardware, to provide an unique experience.
In what hardware can do, what programming languages are the official one, THE framework to do XYZ.
Not a mismatch of pieces that often we need to break a corner so that they barely fit with each other.
That reminds me, I should pull out my NeXT Cube and play with it. That machine is 33mhz of pure power. :-D None the less I still love it.
With that said, the dream is not dead. There's a project named Gershwin (https://github.com/gershwin-desktop/gershwin-desktop), which is a Mac-like desktop environment built on top of GNUstep. Gershwin appears to be heavily inspired by Apple Rhapsody (https://en.wikipedia.org/wiki/Rhapsody_(operating_system)) with some modern touches.
My supervisor used to have a Cube, and every time I visited his office for demos or questions, there it was left in the corner, with the expectation that everything related to NeXT was going to be away.
Thus this project, and others, as means to keep the research going.
This was before Jobs coming back to Apple, and OpenStep not really going as well as hoped for.