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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.
BTW, in case you care, in my arch install script I have listed all the KDE packages I actually care about, in case you want/need a KDE install that's not so minimal it lacks features, but also not super bloated: https://github.com/tralph3/arch-install/blob/master/packages.sh
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.