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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.
https://stratis-storage.github.io if you're interested. I was following it a lot before since ZFSonLinux wasn't in the best state, but once they merged that and FreeBSD into OpenZFS and I saw how slow the pace of Stratis was, I just kinda forgot about it.
NOTE:
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Hence, a higher number means a more popular project.