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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.
Yes. Portmaster is indeed free. Go straight to the source, safing.io and download it there. You don't need the software store to install .deb packages, well any packages for that matter.
but SPN is open source as well
NOTE:
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Hence, a higher number means a more popular project.