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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 need realtime training on unsupervised data, have a look at https://github.com/numenta/NAB and the benchmark solutions. I played with them some time ago and the results seemed interesting
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Hence, a higher number means a more popular project.