DSTIKE WiFi Duck

Features:
This open source project aims to provide a user-friendly tool to learn about keystroke injection attacks.
The microcontroller acts as a USB keyboard that is programmable over WiFi.
It's using the Ducky Script language that Hak5 introduced with the USB Rubber Ducky.
A keyboard is trusted by most operating systems by default, which enables for a variety of attacks.
Humans might not type very fast, but an automated device like this can. It can open a terminal and mess with your computer in a matter of a few milliseconds.