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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.
Outcome comes in two variants, Standalone and Boost.Outcome. It has shipped into billions of devices worldwide over the past years - indeed, both your work computer and your phone almost certainly have code running on them which uses Outcome. You can find Outcome in vcpkg, Conan, and very soon now cpp-pm which are all three major package managers for C++.
Try https://github.com/eyalz800/zpp_throwing, maybe you'll like it.
NOTE:
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Hence, a higher number means a more popular project.