If you think about beautiful operating systems with the best security tools inside you won´t overhear Kali Linux. Never was it so mighty and easy to set and proof your own IT security network.
Kali Linux is an open source project that is maintained and funded by Offensive Security a provider of world-class information security training and penetration testing services. In addition to Kali Linux Offensive Security also maintains the Exploit Database and the free online course Metasploit Unleashed.