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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.
You can setup an freeradius server(or 2) to handle the authentication requests (https://freeradius.org/)
NOTE:
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Hence, a higher number means a more popular project.