I set up Kali on a headless Raspberry Pi 3 for a portable network penetration setup. There's a surprising amount of power in these little guys! : r/hacking
Headless Raspberry Pi Setup - SparkFun Learn
Raspberry Pi Headless Setup With WiFi and SSH Enabled — The Ginger Ninja
Setting up a Headless Raspberry Pi and Using It as an Access Point - News - SparkFun Electronics