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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.
Yeah, as long as it's still around. When I checked, a big fat zero transactions in the last 90 blocks. Around 500 USD daily exchange turnover, as can be seen here on CMC. Last commit to source code over half a year old. (Well, their GitHub is given as only a copy, but their BitBucket seems dead.)
NOTE:
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Hence, a higher number means a more popular project.