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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.
To see some of the features, example usage and to get it yourself; check out the repo on GitHub: https://github.com/RamblingMadMan/metacpp
Not sure about the ThinkCell business, but {fmt} is a fantastic library. Fantastic enough to actually make it into the C++ standard library. You can check out their site here: https://fmt.dev/
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.