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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.
According to https://github.com/taviso/123elf/issues/105 there is no real chance for getting a FOSS license here.
Lurking around for text based spreadsheets for Linux brought this one, which can import/export xls and xlsx, use GNUPlot for graphing and Lua for scripting.
https://github.com/andmarti1424/sc-im
Already packaged in Debian and Alpine, possibly others.
NOTE:
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Hence, a higher number means a more popular project.