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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 wrote one a while back, based on a blog post showing how to do it in Go. I don't know how performant it is, but it runs mandelbrot.b in under ten seconds.
NOTE:
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Hence, a higher number means a more popular project.