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. :
How to Install Steam Link on Raspberry Pi (and play PC games) – RaspberryTips
Valve's Steam Controller and Steam Link don't work with Mac | Trusted Reviews
Arcade stick support seems to have been added to Steam Link? : r/Steam
Best Steam Link Controllers and Couch Gaming Lapboards | RealGear
Steam Link update enables Xbox One S controller Bluetooth compatibility | VentureBeat
Reset Controller Buttons on Steam Link for tvOS – JoshMcCarty.com
Xbox app via STEAM LINK :: Help and Tips
Steam Link für iOS: Unterstützt nun Controller der Xbox Series X|S
VirtualHere For Steam Link on Steam
Xbox One S Wireless Controller (Bluetooth and Steamlink) (PC Gaming) - YouTube
Does this controller work with steam link? It won't turn on or anything : r/Steam_Link
The Best Controller For Steam (Isn't What You Think) – Review Geek
Samsung TVs have a new Steam Link streaming app that works shockingly well | PC Gamer
Qisahn.com - For all your gaming needs - Steam Link
How To Connect An Xbox One S Controller To Steam Link PC: Bluetooth Controller Update Tutorial - YouTube
Steam Controller and Steam Link on sale for 30% off at GameStop – Destructoid
Steam Link: XBOX 360 Controller anschließen - so geht's - CHIP
How to add Windows 10 xbox app to steam library (and play via STEAM LINK) :: Help and Tips
Microsoft's Xbox One S Controller Doesn't Support Steam Link - WinBuzzer
Xbox One's wireless-controller dongle will work with Steam Link (correction) | VentureBeat
Steam Link: XBOX One Controller verbinden - so geht's - CHIP