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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.
While true that the absolute minimum install of alpine linux is gnu free I don't think it's fair to say alpine is gnu free...the build-base meta-package for a basic development environment pulls in gcc, binutils and patch, the default make tool of alpine is a gnu make fork, packages like gettext, octave, bison...are all available in the alpine repositories.
NOTE:
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Hence, a higher number means a more popular project.