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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.
It's also fully open source, so it can be hacked easily (hardware and/or software). All of the design files and information are available on github, check it out if you're interested!
NOTE:
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Hence, a higher number means a more popular project.