MHeironimus/ArduinoJoystickLibrary

This library can be used with Arduino IDE 1.6.6 or above (see Wiki - Testing Details for more information) to add one or more joysticks (or gamepads) to the list of HID devices an Arduino Leonardo or Arduino Micro (or any Arduino clone that is based on the ATmega32u4) can support. This library will also work with the Arduino Due, thanks to @Palakis. A complete list of supported boards can be found in the Wiki - Supported Boards.