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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.
Not sure how dead is the dead you're referring to. There's a repo and a tiny website for XTank that's only 5 years old; it references a commit from 31 years ago (which isn't far enough back to be the UNIX epoch).
NOTE:
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Hence, a higher number means a more popular project.