Easy way to access SignalK data from the command line, for example if you use the Influx / Parquet / Quest etc plugins to store the NMEA and other datapoints.

Outputs to CSV, JSON or optionally Apache Arrow for easy use by Polars or similar data analytics packages. Auto-discovers local SignalK server, auto-aggregates or lets you choose aggregation, supports date durations ( SignalK only supports time durations ) and has a cardinality report to quickly assess what paths are stored and how much useful data they have in them.

Open source, free, Apache 2.0 licensed.

https://pypi.org/project/signalk-cli/

It's a Python library but no python coding experience needed, just python running locally, or use with the Astral uv tool without installing signalk-cli or its dependencies. Examples in the README.md