Kali Linux

Kali Linux is based on Debian. It comes with a large amount of penetration testing tools from various fields of security and forensics. And now it follows the rolling release model, meaning every tool of your collection will always be up-to-date.

It is the most advanced penetration testing platform out there. It supports a wide range of devices and hardware platforms. Moreover, Kali Linux provides decent documentation and a large & active community.

BackBox

BackBox is a Ubuntu-based distro developed for penetration testing and security assessment purpose. It is one of the best distro in its field.

BackBox Linux

BackBox has its own software repository providing latest stable versions of various system & network analysis toolkits and the best known ethical hacking tools. It is designed with minimalism in mind and uses XFCE desktop environment. It delivers a fast, effective, customizable and complete experience. It also has a very helpful community behind it.

Parrot Security OS

Parrot Security OS is relatively new in the game. Frozenbox Network is behind the development of this distro. The target users of Parrot Security OS are penetration testers who need cloud friendly environment with online anonymity and encrypted system.