USBJoy2.0E adapter - Extended Version. Connect your Atari Amiga C64 joystick to PC! Develop your own usb device! - Polish electronics for 3D printers, CNC, robotics, retro computers
GitHub - MonsterJoysticks/9-Pin-Joystick-to-USB-Adapter: Firmware for the 9 Pin Joystick to USB Adapter
USB Joystick Adapters – breadbox64.com
Digital Joystick to USB Adapter (diy, cheap and easy) - English Amiga Board