Neo Auth is a NeoForge version of the Auth Me mod by Axieum.
To quote the original mod:
A Minecraft mod that brings account authentication into the game in the efforts of overcoming the infamous session validation error when connecting to a server.
It is a client-side only mod. Neo Auth is built on the NeoForge mod loader.
I will not port this mod to Fabric since Auth Me exists.
Downloads will be located on CurseForge