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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've had a decent experience with Artemis, but it requires the user to do nearly all the setup. If you have plenty of time to mess around and figure things out, it's really good, but if you want something that just works, look elsewhere.
NOTE:
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Hence, a higher number means a more popular project.