Figured it could be nice to keep a list of Qt/KDE apps that can help fill the gaps in Haiku's software line up for the time being.
Scribus, desktop publishing application.
Hydrogen, drum machine.
Rosegarden, sequencer/score editor.
Qtractor, digital audio workstation.
FreeCAD, CAD tool.
LyX, LaTEX editor.
...are all ones that stand out off the top of my head. Any others?