I have only looked at the movie, because I avoid tools that work with only one provider, however this app doesn't seem to use that many OS X controls, and quite

I have only looked at the movie, because I avoid tools that work with only one provider, however this app doesn't seem to use that many OS X controls, and quite a lot of custom drawing (branches, editor, etc). I think this could be done in Qt with QML, the most difficult problems would probably be the list that popped up on the right at one point and getting the scrollbars right. When it comes to graphics, animation and custom drawing Qt is very powerful, the issues that do pop up are with native controls.