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.