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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.
Shameless plug: If you want your C-API to be more ergonomic, you may want to use PTL (a small header-only library I'm writing that provides STL-like types that are intended to be binary stable interfaces-types).
There's a proposal for that. Check out https://github.com/cplusplus/papers/issues/842
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.