> communist ideologies outside of ML

Color me intrigued. Any good books to recommend?

Nothing springs to mind that gives a good overview without going to primary sources. It's been literal decades since I spent time reading up on a wide range of these ideologies.

This Wikipedia list is reasonably comprehensive: https://en.wikipedia.org/wiki/List_of_communist_ideologies

The main split is between "right-communists" and "left-communists" (hence Lenins "Left Wing Communism: An infantile disorder"; the Bolsheviks were considered "right"), where the "left" are those who rejected ML/Leninism on the basis of "democratic" centralism and the idea of a vanguard party.

Most of the anti-ML ideologies like council communism, anarcho-communism, libertarian Marxism are in that category.

Perhaps texts by Joseph Dejacques, Kropotkin, Rosa Luxembourg, Emma Goldman would give a reasonable introduction to those.