KDE is the community, not the toolkit. Most KDE specific widgets have been merged/replaced in Qt over time. KF5 mostly is a bunch of small libraries using Qt.

KDE is the community, not the toolkit. Most KDE specific widgets have been merged/replaced in Qt over time. KF5 mostly is a bunch of small libraries using Qt. http://dot.kde.org/sites/dot.kde.org/files/kf5_big_0.png http://dot.kde.org/sites/dot.kde.org/files/kf5_big_0.png Qt is also used by a few "big" software and as the default toolkit for BB10, Jolla and Mer (totaling a nice 1% market share ;) ). It is also seen as the successor to Motif for large scientific applications.