Dimensional Tracker

Server-side Fabric and NeoForge mod that colors nicknames based on the dimension a player is in.
Compatible with VT AFK Display, Sessility Mod and Text Placeholder API

This mod utilizes vanilla scoreboard teams to color nicknames and provide optional placeholders [Fabric only].

Customization

With default settings:
Green = Overworld
Red = The Nether
Purple = The End

Config file is located in config/DimensionalTracker.properties.

Team configuration

If you don't want to be detected, simply join a different team.
You can modify your team's color, add a prefix or suffix using the standard Minecraft /team command.
To add support for non-vanilla dimensions, create a team named dimTracker.<dimension_name>.

Placeholder Configuration (Fabric only)

Dimensional Tracker provides three placeholders:

%dimensional-tracker:dimension_color%: The color of the dimension the player is in
%dimensional-tracker:dimension_name%: The name of the dimension the player is in
%dimensional-tracker:dimension_id%: The id of the dimension the player is in You can configure the placeholders in the config file.

Why this mod instead of datapacks?

Because of how datapacks work they should check dimensions every tick. It's okay for singleplayer, but on servers it can cause lag.
In testing, I saw that it can take up to 30% of MSPT for 10 players:

Example of how mod works using Immersive Portals

Example