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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.
I've been using boost since forever and never really had any complaints. Recently though I stumbled across a list of good open-source apps (link) and gave Infinity and Slide a try.
NOTE:
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Hence, a higher number means a more popular project.