[malmz]

People always talk about the license and stuff but personally, i always shy away from Qt because the only real choice for language is C++ and maybe python. Gtk being written in C gives it much more flexibility in what languages can bind to it.

[dTal]

I think this is the biggest reason. Qt is half a GUI toolkit, half an elaborate library for making programming in C++ more bearable. It even has a custom preprocessor. Generating bindings for it is nearly impossible. C++ isn't the only game in town for desktop programming anymore.

It's a shame because as a user, Qt is the most pleasant of all the toolkits.