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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.
Trivial. Set up your favorite IRC server, UnrealIRCd would be fine, then create a tor onion service, but instead of forwarding port 80 (HTTP), you'd forward 6667 (IRC). Done.
NOTE:
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Hence, a higher number means a more popular project.