Perhaps you were thinking of GTK-MUI -
http://sourceforge.net/projects/gtk-mui/"A GTK+ to MUI (Magic User Interface) wrapper library, that makes it possible, to compile GTK+ programs for AmigaOS/AROS/MorphOS without any changes to the sources. The result is a native AmigaOS/AROS/MorphOS program with a native MUI GUI."
Great news about Netsurf! I've just finally got broadband after years of dialup, so I'll be setting up my Acorn RiscPC and trying Netsurf out on that. It would be great to see a 68k version too, although I have a feeling it won't be very usable on my A1200/030, but it'll be great for UAE and Amithlon users.