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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.
If you're looking at October I'd give Winter a look too (https://wintercms.com), October is no longer open source and Winter is the open source fork of October. (Disclaimer: I'm the lead maintainer for Winter CMS)
NOTE:
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Hence, a higher number means a more popular project.