Is something like this even possible?
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GOG Galaxy is a frontend for a whole bunch of game stores, including Steam and Epic. Even does things like messaging and activity reporting cross platform. On the Linux side I know Lutris does some Steam management.
You can use the command line version of Steam to do some stuff, but because that’s the only real API, all alternative frontends involve installing some version of Steam.
Piracy
That’s not what they’re asking about.
- Lutris can work as more of an alternative launcher (and can handle picking the best Proton version)
- AdwSteamGtk is a GTK (Adwaita) wrapper
- ProtonUp-Qt is a little standalone tool for managing compatibility tools for Wine and Steam (including Proton GE, Luxtorpeda, Boxtron, etc.)