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matplotlib-cpp
Extremely simple yet powerful header-only C++ plotting library built on the popular matplotlib (by Cryoris)
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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.
Nevertheless there are now package managers for C++ libraries that make this much easier, namely Conan and vcpkg. I suggest you to use one of those for using matplotlib-cpp in your project. Vcpkg is likely the easiest for you to use:
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.