Kali Linux
Kali Linux is a security-focused Linux distribution based on Debian. It's a rebranded version of the famous Linux distribution known as BackTrack, which came with a huge repository of open source hacking tools for network, wireless, and web application penetration testing. Although Kali Linux contains most of the tools of BackTrack, the main objective of Kali Linux was to make it portable to be installed on devices based on ARM architectures, such as tablets and the Chromebook, which makes the tools easily available at your disposal.
Using open source hacking tools comes with a major drawback—they contain a whole lot of dependencies when installed on Linux, and they need to be installed in a predefined sequence. Moreover, the authors of some tools have not released accurate documentation, which makes our life difficult.
Kali Linux simplifies this process; it contains many tools preinstalled with all of the dependencies, and it is in a ready-to-use condition so that you can pay more attention to an actual attack and not on simply installing the tool. Updates for tools installed in Kali Linux are released frequently, which helps you keep the tools up to date. A noncommercial toolkit that has all of the major hacking tools preinstalled to test real-world networks and applications is the dream of every ethical hacker, and the authors of Kali Linux made every effort to make our lives easy, which lets us spend more time on finding actual flaws rather than on building a toolkit.