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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.
https://nix.dev/ is the best in depth resource I know but it's a work in progress.
NixOS package search and NixOS option search to browse around. You can even clone nixpkgs and grep through files, read git logs etc.
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.