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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 imenu one is very cool too. BTW, you might be interested in Deffy if you haven't seen it already (you probably have, considering how many times I've pasted the link here and there).
NOTE:
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Hence, a higher number means a more popular project.