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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.
As for quick GUIs for your shell scripts, Tk is a fairly bad toolkit, and I covered many better ones in my Electron Adventures series. But even if you really want to use Tk, somehow many modern languages like Ruby and Python still include some kind of Tk code in their standard library for historical reasons.
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.