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matplotlib-cpp
Extremely simple yet powerful header-only C++ plotting library built on the popular matplotlib
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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.
Since you mentioned it, there is a wrapper for matplotlib: https://github.com/lava/matplotlib-cpp
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.