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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++.
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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Try https://github.com/eyalz800/zpp_throwing, maybe you'll like it.
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.