There are 2 repositories under 1-20-6 topic.
Minecraft Wurst Hacked Client v7
The zoom from the Wurst Client as a standalone Minecraft mod.
Minecraft mod that adds glass stairs and glass slabs. They look great in any build and connect seamlessly with vanilla glass blocks.
MCP-Reborn is an MCP (Mod Coder Pack) for Minecraft for making modded clients and researching its code.