TargetNameplateIndicator is a WoW AddOn that puts a texture on your target's nameplate to make them stand out.
It can be configured by editing the options at the top of core.lua.
You can download the AddOn from CurseForge or WoW Interface.
You can also find the latest alpha versions on CurseForge and the source code on GitHub.
The AddOn and its source code are licensed under the terms of the MIT License, detailed in LICENSE.txt