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oil
Oils is our upgrade path from bash to a better language and runtime. It's also for Python and JavaScript users who avoid shell!
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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.
If you'd like to see an extended example of it, I've used REON to generate textmate syntax highlighting files because I dislike using JSON for it
Shameless plug: I am working on such a configuration language too, Nickel, which could be seen as a descendant of the Nix expression language. It features gradual typing, contracts, and a merge operation inspired both from CUE and the NixOS module system.
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.