Module 10: How to install Kali Linux on VirtualBox
Kali Linux is the new generation of the industry leading BackTrack Linux penetration testing and security auditing Linux distribution
Kali Linux is preinstalled with many different penetration-testing programs, including: Nmap (port scanner), Wireshark (packet analyzer), John the Ripper (password cracker), Aircrack-ng (a software suite for penetration-testing wireless LANs), Burp suite and OWASP ZAP (both web application security scanners), Metasploit (a tool for developing and executing security exploits)
References:
Penetration Testing Redefined with Kali Linux. (n.d.). Retrieved February 18, 2015, from https://www.kali.org/