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qskinny
A lightweight framework on top of the Qt scene graph and only few classes from Qt/Quick. It is usable from C++ and/or QML.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
It kind of is (with a 3rd party library). Or you can use the private API (which I would not recommend). A public C++ API for Qt Quick Controls is planned as well, but I'm not very optimistic on the time frame.
NOTE:
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Hence, a higher number means a more popular project.