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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.
The original 2004 freeware release is still conveniently available on the Tribute site. But if you want something more modern with more quality of life features, you can try doukutsu-rs.
NOTE:
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Hence, a higher number means a more popular project.