KeyBoh Is an Open Source Arduino Leonardo Shield for Making Custom USB Keyboards - Hackster.io
USB Pedal HID Keyboard With Arduino Leonardo : 9 Steps - Instructables
Virtual Keyboard Pro Micro USB ATMEGA32U4 AU 5V 16MHz MINI Development Board I2C Module For Arduino Leonardo R3|module for arduino|module i2cmodule 5v - AliExpress
USB HID
Pololu - Arduino Leonardo
Using Arduino as Keylogger - Arduino Stack Exchange
Can Arduino make USB devices? Try using the HID function with Arduino Pro Micro (Leonardo)
USB to USB keyboard converter build log(Pro Micro 3.3v with mini host shield)
TF MicroSD Micro SD Card Slot BadUSB USB Virtual Keyboard ATMEGA32U4 Module for Arduino Leonardo R3 Bad Usb CJMCU - buy at the price of $5.42 in aliexpress.com | imall.com
Arduino®-Leonardo USB HID Keyboard & Mouse Tutorial and Advanced Serial Port Examples | Cal-Eng : Electronics & Robotics
Overview | USB NeXT Keyboard with an Arduino Micro | Adafruit Learning System
Pro Micro Beetle Keyboard USB ATMEGA32U4 Mini Development Expansion Board Module for Arduino Leonardo R3 16Mhz DC 5v|Integrated Circuits| - AliExpress
KeyboardAndMouseControl
USB Pedal HID Keyboard With Arduino Leonardo : 9 Steps - Instructables