GC to SW Controller Adapter
With this controller adapter you can connect 4 GameCube controllers to your Switch.
PS3/PS4 to SW Super Converter
PS3/PS4 to SW Controller Adapter lets you use your PS3/PS4 controllers to play games on Switch.
Xbox 360/Xbox One to SW Super Converter
Xbox 360/Xbox One to SW UController Adapter lets you use your Xbox 360/Xbox one controllers to play Switch.