NonSteamLaunchers is a tool to let you easily install launchers for different game platforms, as well as installing their games properly where they can be launched directly through steam.

Supported launchers:

• Amazon Games Launcher ✔️
• Battle.net ✔️
• EA App ✔️
• Epic Games ✔️
• GOG Galaxy ✔️
• Humble Games Collection ✔️
• IndieGala ✔️
• Itch.io ✔️
• Legacy Games ✔️
• Rockstar Games Launcher ✔️
• Ubisoft Connect ✔️
• Glyph ✔️
• Minecraft ✔️
• Playstation Plus ✔️
• VK Play ✔️

It also supports making web apps for the following:

• Website Shortcut Creator ✔️
• Xbox Game Pass ✔️
• GeForce Now ✔️
• Amazon Luna ✔️
• Netflix ✔️
• Amazon Prime Video ✔️
• Disney+ ✔️
• Hulu ✔️
• Youtube ✔️
• Twitch ✔️
• movie-web ✔️

There are better options for some of these game launchers, things like Heroic and Junk store would be better options for Epic for example. However this tool supports a ton of platforms, and is very possibly the easiest way to play games from a lot of these platforms on Deck.