News for hackers. Stuff that matters.
Re:WxWidgets 3.1.0 Brings Better HiDPI Support, WxQt with Qt5 by scrollaway on Tuesday March 01, 2016 @02:17PM (#11205282)
Transmission?
Re:WxWidgets 3.1.0 Brings Better HiDPI Support, WxQt with Qt5 by coldtea on Tuesday March 01, 2016 @03:11PM (#11205682)
From their page: "The Mac OS X interface is written in Objective-C and uses Growl notifications and dock badging to keep you informed".

They have different OS X (Cocoa/Obj-C), QT and even GTK implementation of the UI.