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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.
Well, there's the legendary QtCurve. Don't know why it is not longer included in the default KDE install, or if it even can be used in KDE5, though.
NOTE:
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Hence, a higher number means a more popular project.