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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.
This page from the CN wiki is a good starting point; in general the CN wiki tends to give more detailed info on mechanics. I suggest getting a browser extension to autotranslate pages unless you can read Chinese already. There's also the datamines, which have a lot of info if you can navigate them.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.