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Toolkits that use the core X font protocol include Xt, Xaw, Xaw3d, Motif clones, Tk and GTK+-1.2.
Toolkits that use Xft are Qt and GTK+-2.
Over time, fontconfig/Xft will replace the core X font subsystem. At the present time, applications using the Qt 3 or GTK 2 toolkits (which would include KDE and GNOME applications) use the fontconfig and Xft font subsystem; most everything else uses the core X fonts.