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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.
I haven't used it in a while but xclip is a thing for X11 and you can create your own keyboard shortcuts and present a window with zenity or something.
NOTE:
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Hence, a higher number means a more popular project.