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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.
Only tangentially related, but there's the sciruby. It's not as fully featured as similar Python libraries, and that might give an indication of where the Ruby world is at when it comes to scientific work.
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Hence, a higher number means a more popular project.