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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 also that much of the standard library is generic, so studying it can be instructive. There are also many free libraries available, such as the PragmAda Reusable Components that contain many generic units.
NOTE:
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Hence, a higher number means a more popular project.