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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.
There is an open source stackexchange clone that I looked at a long time ago for a Foundry third party dev focused Q&A site. Maybe people will like it (of course moderation volunteers and hosting will need to be figured out).
NOTE:
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Hence, a higher number means a more popular project.