I've been searching for ways to run a GTK+ application on a browser.
WebKit and its associated GTK+ port seem to do the opposite - making applications more Web-friendly, but the opposite would also be nice.
There seems to have been some activity to realize that for XCode, with Cappuccino and Atlas, that can translate NIB files into CIB files.
If anyone can point me in the right direction, I'd really appreciate it.
The WebKit port is just a port of the WebKit browser engine to use GTK+ API:s whenever possible. So, instead of using pthreads directly to create a thread, it uses GThread and so on.
What you're asking is completely different, not "the opposite".
Actually, it isn't very clear what you're asking. Do you want the browser (client-side) to execute the GTK+ application code, and somehow magically transform the interface into web controls? That seems extremely difficult, my answer would be "no, that is not possible".