[pak9rabid]

Good 'ol GNUStep. I think the only thing I ran that relied on it was WindowMaker, which was an excellent, minimalistic window manager back in the day.

[pjmlp]

WindowMaker and AfterStep never had any dependencies to GNUStep.

They were often used together though.

[icedchai]

You're bringing back memories. I ran WindowMaker on my Sun desktop (Solaris 2.6, I think?), back in the late 90's. I spent days customizing that system, compiling everything from source.