Plugins
Polars allows you to extend its functionality with either Expression plugins or IO plugins.
Community plugins
Here is a curated (non-exhaustive) list of community-implemented plugins.
Various
polars-xdt Polars plugin with extra datetime-related functionality which isn't quite in-scope for the main library
polars-hash Stable non-cryptographic and cryptographic hashing functions for Polars
Data science
polars-distance Polars plugin for pairwise distance functions
polars-ds Polars extension aiming to simplify common numerical/string data analysis procedures
Geo
polars-st Polars ST provides spatial operations on Polars DataFrames, Series and Expressions. Just like Shapely and Geopandas.
polars-reverse-geocode Offline reverse geocoder for finding the closest city to a given (latitude, longitude) pair.
polars-h3 This is a Polars extension that adds support for the H3 discrete global grid system, so you can index points and geometries to hexagons directly in Polars.
Other material
Polars plugins tutorial Learn how to write a plugin by going through some very simple and minimal examples
cookiecutter-polars-plugin Project template for Polars Plugins