QT is a great framework. Really powerful, yet easy to learn. It has good tools, like the GUI designer, translation tool etc. The python bindings are excellent, so if you don't want to battle the monster that is C++, you have a higher-level alternative. Add to these things the fact that it makes porting a trivial matter. I recommend it.
As for licensing, many years ago there were worries from the Free Software community about the license, but that's obsolete now. Rest easy that it's future is assured as long as people want to use it.
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