Just testing the water... I've been a little bored and started looking at implementing a portion of CoreFoundation on top of libobjc and GNUstep-base, I'm tentatively calling it CoreBase.
At this point I've spent most of my time on the runtime (CFRuntime) and CFBase. I'm not sure if it works, because in CF the runtime requires CFString and CFDictionary and I'll have to at least do some work there before even trying to compile. Because I don't want to have to rewrite/copy parts of what's already in GNUstep-base (like reference counting) I've decided to depend on it. Libobjc is also required because I'm using that as a gateway to -base, and using some of it's features (like the class number stored in class->info to coinside with the CFTypeID).
Before continuing with it (because, of course, time is precious) I want to make sure there's at least some interest. I'm also going to need a fairly high degree of help on this project because certain parts are out of my league (I still think it's an interesting learning experience).
Anyway, just let me know if it's a project I should keep moving forward.