Meteor Client 1.20.1

is widely considered the best free, open-source utility mod (client) for Minecraft 1.20.1. It is designed for anarchy servers (like 2b2t) but works on any server where you are willing to risk using it.

Here is a comprehensive guide to getting started, understanding the UI, and using the main features in version 1.20.1. meteor client 1.20.1