I did a lot of work on the Win32 backend for GTK+ a few years ago, but then when I started at Canonical I stopped working on that. Nobody else really picked it

I did a lot of work on the Win32 backend for GTK+ a few years ago, but then when I started at Canonical I stopped working on that. Nobody else really picked it up either. Tor Lillqvist was the original developer of this, and I think he's basically stopped working on it as well. It's been awhile since I used wxWidgets, but I had an absolutely awful time with it. Honestly if Qt wasn't around, I would choose to contribute to GTK+ to get it back into shape rather than be forced to use fucking wxWidgets. If I were in the situation of needing to work on a cross-platform GUI app again, having the experience I already have with GTK+ and its Win32 backend, I would choose to go back to contributing to the Win32 backend and write my app using GTK+ (or probably Gtk# with .NET and Mono). But if I were in your position and did not already have both the experience with the Gdk backend and the predisposition to use GTK+, I would absolutely use Qt.