Polars is also based on McKinney’s Arrow project.
Polars is a DataFrame interface on top of an OLAP Query Engine implemented in Rust using Apache Arrow Columnar Format as the memory model.
Wes also literally created another Python dataframe project, Ibis, to overcome many of the issues with pandas
most data engines and dataframe tools these days use Apache Arrow, it's a bit orthogonal
Polars is also a wonderful project!