Not sure if you mean on the hardware side or on the computer, the Teensy is a family of small dev boards which are easy to work with in the Arduino IDE, and can

Not sure if you mean on the hardware side or on the computer, the Teensy is a family of small dev boards which are easy to work with in the Arduino IDE, and can emulate USB HID devices (including mouse and/or keyboard) [1] 1: https://www.pjrc.com/teensy/td_mouse.html https://www.pjrc.com/teensy/td_mouse.html