ViaFabricPlus is a Minecraft mod that implements the ViaVersion projects into Fabric and provides tons of fixes to the existing protocol translation which can't be implemented in the original ViaVersion project.
These fixes consist of movement changes, block/entity collisions, rendering changes, and many more.
For more details, visit the GitHub repository.
The ViaVersion suite allows server owners as well as players to connect to servers of different Minecraft versions.
I use my personal projects to get new ideas and take a break from the usual ViaVersion work.