Man, I love GNUStep. I haven't done anything serious with it, but I did play around with it for a while and enjoyed every second. I event went all-in on WindowMaker for a couple of months lol. It really opened my eyes to how awesome Objective-C is as a language, and almost made me want to become an iOS/Mac developer.

Etoile is dead afaik, but there are some people making another GNUStep-based DE called Gershwin (https://github.com/gershwin-desktop/gershwin-desktop) for GhostBSD.