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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.
While the project itself is not open source, I have created a GitHub project to track issues, feature requests and development progress here: https://github.com/LeoKlaus/Paperparrot
NOTE:
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Hence, a higher number means a more popular project.