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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 backed their kickstarter and have left them a comment plugging Exolve (https://github.com/viresh-ratnakar/exolve/blob/master/README.md) to them for setting up interactive online crosswords.
NOTE:
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Hence, a higher number means a more popular project.