Kali Linux is an advanced Penetration Testing and Security Auditing Linux Distribution, based on Debian development standards. Kali Linux- a complete re-built of Backtrack Linux , was developed by Offensive Security . Kali Linux is completely open source and come free of cost. It offers more than 300 penetration testing tools with timely security updates, support for the ARM architecture, a choice of four popular desktop environments and seamless upgrades to newer versions. Kali Linux is distributed in 32-bit and 64-bit images for use on hosts based on the x86 processor architecture, as well as an image for the ARM architecture for use on the Raspberry Pi computer, rk3306 mk/ss808 , ODROID U2/X2 and on Samsung's ARM Chromebook . Earlier release of Kali Linux: Kali 1.0.2 – 27th March, 2013 – Minor Bugfix Release and update roll-up. Kali 1.0.1 – 14th March, 2013 – Minor Bugfix Release. Kali 1.0 – 13th March, 2013 – Initial release.