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skycfg
Skycfg is an extension library for the Starlark language that adds support for constructing Protocol Buffer messages.
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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.
This is good and there are several other options like https://github.com/stripe/skycfg#why-use-skycfg to add full language support (using Go or python for ex) to configurations.
NOTE:
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Hence, a higher number means a more popular project.