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drogon
Drogon: A C++14/17/20 based HTTP web application framework running on Linux/macOS/Unix/Windows
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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.
https://github.com/drogonframework/drogon has the best performance afaik
https://github.com/CrowCpp/Crow is super easy to use
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Hence, a higher number means a more popular project.