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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 think it is safe; I have not audited it, but according to the source repo (https://gitlab.com/divested-mobile/hypatia) they only use local scanning and connect only to download signatures.
NOTE:
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Hence, a higher number means a more popular project.