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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.
And, of course, I use it in my projects (always eat your own dogfood). For example, here: https://github.com/kjhermans/naigama/blob/master/src/gen3/include/naigama/naig_defines.h (not complete, as in this project this concept is spread out over multiple include files).
NOTE:
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Hence, a higher number means a more popular project.