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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.
It helped when I found out that the extension actually is open source and described it plainly: https://github.com/pia-foss/extension-chrome/blob/b9165bc591cc2d3e1c74b653be9640572234d491/docs/public/release.md#update-region-data).
I haven't used their desktop app, but I assume it is this?: https://github.com/pia-foss/desktop
NOTE:
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Hence, a higher number means a more popular project.