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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.
Note that this has nothing to do with the Raspberry Pi. You'll have the same issue running on the command-line. If you wish to test your programs on your computer where you have more tools and horse-power, I find swift-sh gives a good command-line experience and is a great alternative to Playgrounds especially for small tests.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.