There are 6 repositories under steam-emulator topic.
MIRROR REPO - Credits : Mr. Goldberg. Steam emulator that emulates Steam online features. Lets you play games that use the Steam multiplayer APIs on a LAN without steam or an internet connection.
How to install Seamless Co-op Mod for Elden Ring + Error Fixes
Steam emulator prototype using the Steam Pipe protocol.
SSELauncher Comfy Edition 2018 By LoodBot/Syahmixp (Steam Emulator)
Automatically adds goldberg emulator to steam file, allowing you to play online games in local lan.