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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.
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span-lite
span lite - A C++20-like span for C++98, C++11 and later in a single-file header-only library
For span only span-lite should be suffice https://github.com/martinmoene/span-lite
NOTE:
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Hence, a higher number means a more popular project.