Posted Dec 22, 2011 22:48 UTC (Thu) by rahulsundaram (subscriber, #21946)
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Sure. Libreoffice uses VCL, or Visual Components Library with native desktop integration and has both GTK and Qt frontends. Firefox uses XUL with GTK integration. Neither are pure GTK apps and have occasional regressions on look and feel that doesn't match the rest of the GTK apps as a result.