QSkinny is a UI framework based on the Qt graphic stack and written in C++. It allows users to write their UIs in C++ and/or QML.
Figure 1. Sample QSkinny UI
It is currently being used as the main technology for a UI for an agricultural machine which is being used in production. In this project, there is no QML used at all; the whole codebase is written in C++. In general, using QML together with QSkinny is possible though.
An overview of how QSkinny fits into the Qt architecture is depicted below:
Figure 2. QSkinny sits on top of QtQuick, while QML is optional