Din-don, din-don-din...
I have seen a Python developer reading this thread. Well, integration of python with Qt is also welcome in the wiki.
Where are the developers? I'm afraid they are just silent.
But I hope that they silently add more articles to the wiki.
Here I call out some Qt-based applications:
Mbarcode
Mebook
Pen Pen
ejpi
Faster Application Manager
Filebox
Qthello
QStardict
Stellarium
Maelophone
Ship is rolling
Sketchyaetch