The quieter you become, the more you are able to hear

Kali Linux is a Debian-derived Linux distribution designed for digital forensics and penetration testing. It is maintained and funded by Offensive Security Ltd. It was developed by Mati Aharoni and Devon Kearns of Offensive Security through the rewriting BackTrack, their previous forensics Linux distribution.
Kali Linux is preinstalled with numerous penetration-testing programs, including nmap (a port scanner), Wireshark (a packet analyzer), John the Ripper (a password cracker), and Aircrack-ng (a software suite for penetration-testing wireless LANs). Users may run Kali Linux from a hard disk, live CD, or live USB. It is a supported platform of the Metasploit Project's Metasploit Framework, a tool for developing and executing security exploits.
Kali Linux is distributed in 32- and 64-bit images for use on hosts based on the x86 instruction set, as well as an image for the ARM architecture for use on the Raspberry Pi computer and on Samsung's ARM Chromebook.

After all this nice reading today, I just prepared a Kali Linux machine by using Virtual Box. It works like a charm!

Kali Linux (Wikipedia)