Comment by Findecanor

The free clone "LessTif" already existed when "GTK+" 1.x came along.

I agree that GTK was much easier to program, and had a better feel but the look was mimicking Motif except that every widget instead used a shaded button-style border — and that looked very ugly IMHO.

However, GTK 1.x supported theme engines. Back in the day, my theme for GTK 1.x was one of the most popular, giving programs a look reminiscent of NeXTStep and Windows 95. The engine also (optionally) hacked the GTK widgets, adding triangular tabs and subtly improved menu behaviour. When GTK 2.0 came along, it had a much improved default look that felt like its own thing, and also the new menu behaviour so my theme wasn't needed any more.