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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.
Bindings for C++ are tricky due to function name mangling and also due to ABI compat, it's basically impossible to interop with a std::vector for example. Afaik the most common approach is to PInvoke thin C wrappers around the C++ functions. There are tons of binding generators for this but they aren't without problems (not worth if you have a small API surface).
NOTE:
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Hence, a higher number means a more popular project.