In addition to Xbox 360 and Xbox One controllers, it was discovered that Steam Link also supports PS3 and PS4 controllers. I decided to give my Wii U Pro controller a shot. :
The Xbox One S Bluetooth controller doesn't work with Steam Link, yet | VentureBeat
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Steam Link: Xbox One Controller verbinden – so geht's
Will Xbox keyboard controller add on work through steam link? Wanting to pay wow classic with this setup. : r/Steam_Link
Xbox One S Wireless Controller (Bluetooth and Steamlink) (PC Gaming) - YouTube
How to use controllers on the Steam Deck | PC Gamer
Microsoft's Xbox One S Controller Doesn't Support Steam Link - WinBuzzer
No, the Xbox One Wireless Adapter doesn't work with Steam Machines or Steam Link | VentureBeat
Best Steam Link Controllers and Couch Gaming Lapboards | RealGear
The 5 Best PC Gaming Controllers for 2023 | Reviews by Wirecutter
How to set up Steam Link | PCWorld
Pour one out for the Steam Controller, sold out forever after $5 fire sale - The Verge