Between my Qt Favorites there are:
- QpdfView
- Taskbar
Unfortunately not that many new/updated Qt apps over here, because of the assumed Unix directory structures. The Great Divide/2. Directory structures of the original packages, most likely. Some of the OSes of the subject do have such a structure, and some don't. If not, then MKDIR should still work, but MKDIR won't solve a.o. disk full-errors (and e.g. matching BIOS restrictions).
QpdfView sounds like something worth having, votes +1, albeit I have no true favorites, but installing and using it is "not realistic" because it isn't OS/2'ified enough. Votes +1, users -1. A consequence of the respected freedom of choice, and OS/2'ification may be a lot of work.
The number of mentioned Qt apps is less than it could/should have been. With a Qt5-based browser, by users of eCS 2 DE/EN or newer, the difference would have been more clear. I do have QNetWalk (users +1), for example, but not the improved latest version "for Unix". As such Qt apps will be more popular than stats will show, including QpdfView. Hence votes +1.