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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.
Powertab is what I always used, very simple easy to use oldschool software, got updated to run on modern OS's. https://powertab.github.io/ is free.
NOTE:
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Hence, a higher number means a more popular project.