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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.
SO was really hard to manage with its 21 million questions. For this reason, all StackExchanges will update monthly while SO will be every quarter only (until we fix that memory leak: there is a ticket opened to try and fix it, please have a look!).
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.