There is no "top" really. GTK2 is extremely popular, but in the main the toolkit is heavily integrated into the desktop environment being used (when one IS being used). So KDE developers will use QT, Gnome developers will use GTK2, but it's perfectly possible to mix and match if you wish. There is also wxwindows, fltk (both of which are cross platform so work on windows too) and many others, but GTK and QT are definitely the norms.
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