How to install Epic and GOG games on Steam Deck - Dexerto

All-in-One: How to Add Non-Steam Games to Your Steam Library

How to Search & Download Free Games in STEAM Deck

GitHub - derrod/legendary: Legendary - A free and open-source replacement for the Epic Games Launcher

How to install and play games from the Epic Games Store on Steam Deck

How to Install Epic Games Launcher On The Steam Deck With SD Card

Here's How to Get the Epic Games Launcher On Steam Deck

How to install Epic Games on Steam Deck ⚙️

Sorry if already posted: After installing EG through proton you can add the games as non-steam games without issues. Was easier and faster for me, than using Heroic (Covers added with Steamgrid

How to get your Steam Deck to access the Epic Games Store and more - The Verge

Heroic Games Launcher 2.8.0 adds a DLC manager for Epic Games