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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.
Spiritually similar to something else from another former Mozillian:
<https://github.com/rginda/axiom>
And then of course there's Fabrice Bellard's vfsync.org, which grew out of his JSLinux project.
NOTE:
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Hence, a higher number means a more popular project.