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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.
Lazyweb, since searching for "Toybox" wasn't helpful: https://github.com/landley/toybox#readme (although "toybox shell" did help)
And it's BSD Zero Clause, for those who are curious: https://github.com/landley/toybox/blob/0.8.8/LICENSE
NOTE:
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Hence, a higher number means a more popular project.