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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.
For example, I use Isso as my commenting system for my websites. The development has sort of fallen asleep for some time now. There are alternatives, but from my point of view they also have disadvantages. Some of them are not developed further even though there are issues (some of which also concern security).
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.