NonSteamLaunchers is a tool you can use on Linux / SteamOS to automatically set up various third-party stores. A new release brings new tricks.

The app works with Epic Games, GOG, EA, Amazon, Battle.net and lots of others. It uses GE-Proton to install the Windows version of all the apps you pick and then adds it to Steam for you to easily launch (useful for SteamOS / Steam Deck).