Wii Nunchuck As General Purpose Controller Via Arduino Board : 10 Steps (with Pictures) - Instructables
The mini NES Classic controller works with your Wii U Virtual Console games - Polygon
Amazon.com: Wii Nunchuck Remote Controller with Motion Plus Compatible with Wii and Wii U Console | Wii Remote Controller with Shock Function (Black) : Video Games
Amazon.com: 4 Ports Charging Station for Wii Remotes, TechKen Controller Charger Dock Station with 4 Bonus 2800mAh Rechargeable Batteries (Updated Version) : Video Games
2 Pack Remote Wiimote Nunchuck Controller for Nintendo Wii/Wii U Game Console, White - Walmart.com
Does anyone know of any other accessories that used the holes either side of the nunchuck port other than the Wii motion plus? : r/wii