Kali is a great tool for testing the security of your network and the operating system works on just about everything that can run Linux. That includes the Raspberry Pi. What's even better is a new distribution that brings along support for a touchscreen.
Build your own supercomputer out of Raspberry Pi boards Summary: Who says you need a few million bucks to build a supercomputer? Joshua Kiepert put together a Linux-powered Beowulf cluster with Raspberry Pi computers for less than $2,000. Steven J. Vaughan-Nichols By Steven J. Vaughan-Nichols for Linux and Open Source | May 23, 2013