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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.
For advanced use of macros take a loot at Emacs lisp.h and rest of Emacs code if you have time and are interested. Be aware, it is quite advanced, so it is not very readable if you are not used to C. But you can learn a lot from how they use pointers to program "relatively generic" types in a real world applicaiton used by thousands of people. You can see how they use macros to advise debugger, to inline in release mode etc.
NOTE:
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Hence, a higher number means a more popular project.