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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.
the german computer club uses this https://github.com/engelsystem/engelsystem for all of their events with hundres if not thousands of volunteers managed with it.
NOTE:
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Hence, a higher number means a more popular project.