Teensyduino: Using USB Joystick with Teensy on the Arduino IDE
Arduino Leonardo/Micro As Game Controller/Joystick : 10 Steps - Instructables
Programming Ponderings: Arduino Joystick Library - Version 2.0
Arduino UnoJoy gamepad (Windows, XBox emulation) - YouTube
PS2 Wireless Controller: How to Connect & Interface w/ Arduino
GitHub - MHeironimus/ArduinoJoystickLibrary: An Arduino library that adds one or more joysticks to the list of HID devices an Arduino Leonardo or Arduino Micro can support.
m5stack - Xbox 360 controller commands to Uno-compatible board via USB module - Arduino Stack Exchange
Using a Game Controller with Arduino and Processing - YouTube
DIY Joystick Game Controller using Arduino Leonardo and Joystick Module
GitHub - ricardoquesada/bluepad32-arduino: Bluepad32 for Arduino (mirror)
Arduino Leonardo/Micro As Game Controller/Joystick : 10 Steps - Instructables
Wireless GamePad V2.0 for Arduino - DFRobot
Arduino Game Controller V2 - Hackster.io
How can I make a game controller? - Programming Questions - Arduino Forum
Create a Joystick Using the Arduino Joystick Library 2.0 : 12 Steps (with Pictures) - Instructables
Arduino XInput Library - Parts Not Included
Arduino Game Controller V2 - Hackster.io
Teensyduino: Using USB Joystick with Teensy on the Arduino IDE