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LeanQt
LeanQt is a stripped-down Qt version easy to build from source and to integrate with an application.
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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.
Right. In the Gui module you have everything you need for this: platform independent windows and events, 2D bitmap and vector graphics, fonts and even rich text handling. Unfortunately there are some dependencies in Qt Gui to Qt Widgets, but if you use e.g. https://github.com/rochus-keller/leanqt/ instead of original Qt these are resolved. So with this you can implement your own widget toolkit on top of the Gui module if you want, and still benefit from the very powerful platform independent foundations of Qt.