This is a hobby and passion project and yet it looks more alive and better maintained than Étoilé, which features "news" from 2014 about doing random Smalltalk things - and while I _love_ Smalltalk it doesn't give me confidence that they're focused on building a modern Cocoa-style desktop environment.
That, and the last activity on Etoile was quite a while ago, and seems to have stalled out rather badly.
There are some similar ones mentioned in its Wikipedia article:
https://en.wikipedia.org/wiki/FVWM95
IceWM is quite themeable and is actively developed:
Are you talking about Win95's "Maximize" control?
Compare the iconify button with the icons representing iconified windows below:
https://raw.githubusercontent.com/trunkmaster/nextspace/mast...
I do rather like the NeXT aesthetic more, personally.
http://mmcthrow-musings.blogspot.com/2019/06/some-thoughts-a...
However, I just saw a recent comment from one of the current GNUstep maintainers that said that the GNUstep Foundation Kit is now at par with macOS Catalina, and work will begin on updating GNUstep's Appkit implementation, which is currently roughly compatible with Mac OS X Tiger.
Making GNUstep more compatible with recent versions of macOS's Cocoa API will definitely help with enticing more developers to the platform.
>I think GNUstep needs a reference implementation of a user-oriented desktop environment.
I wonder why he didn't just contribute to Étoilé, since he seems aware of it.