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guix
Discontinued Azure RTOS GUIX Studio provides a complete, embedded graphical user interface (GUI) library and design environment, facilitating the creation and maintenance of all graphical elements needed by your device.
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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.
I've used https://github.com/azure-rtos/guix for a few years to run a UI application on an embedded system. It's far from perfect, but probably still better than developing everything yourself.
NOTE:
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Hence, a higher number means a more popular project.