There are 2 repositories under minecraft-authentication topic.
Build your own Minecraft authentication system.
Simple and easy to use Minecraft microsoft authentication library (Java and Bedrock)
This is a library to authenticate a mojang and a microsoft account for minecraft services
Build your own Minecraft authentication system with Mojang authentication server support. A fork of yushijinhun/authlib-injector.
Authenticate to Minecraft using the Microsoft Authentication Scheme from Rust.
A simple Java API for Minecraft authentication
A library for authenticating with Microsoft accounts to access Minecraft services.
Xbox live authentication flow for Minecraft with Rust.
Host your own (shitty) authentication server for Minecraft using the Yggdrasil authentication scheme
A Mojang Yggdrasil Mock Server
A Minecraft launcher for using a custom (shitty) authentication server
A PHP Based Minecraft Yggdrasil Authentication Server for Minecraft Server
Java & C# | Plugin de Minecraft baseado nos servidores de FiveM que necessita entrar no discord e enviar o ID para conseguir conectar no servidor, mas ao invés de ser o id, enviar o nick
SpongeMC authentication server software, based on quarry.
A command-line tool for patching Mojang's authlib as well as Minecraft
A Ruby gem for testing Minecraft account authentication.
Minecraft MoonLake Auth Lib
Simple Mojang API impementation
Discord bot for handling authentication for minecraft servers.
Custom Minecraft Authentication Service and Skin System
Another minecraft authentication plugin (for the third time).
Minecraft authentication plugin using WebAPI.