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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.
There are many samples of code using MFC and WinAPI at Microsoft's Github, although many follow practices that are now seen outdated (e.g. few of them use smart pointers).
NOTE:
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Hence, a higher number means a more popular project.