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fast_io
Discontinued fast_io is a C++ general-purpose exception-safe RAII I/O library based on C++ 20 Concepts. It is at least ten times faster than cstdio or iostream.
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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.
NOTE:
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Hence, a higher number means a more popular project.