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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 like the idea though I'm not sure how this will cope with spam. However just like with an open-source project branding appears to be an issue: a popular web-based client (https://github.com/fiatjaf/branle) is called "branle" which not only doesn't easily roll off the tongue but also means "to jerk off" in French.
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.