Matriux!

Arch Linux is an independently developed, i686- and x86_64-optimised Linux distribution targeted at competent Linux users. It uses pacman, its home-grown package manager, to provide updates to the latest software applications with full dependency tracking. Operating on a rolling release system, Arch can be installed from a CD image or via an FTP server. The default install provides a solid base that enables users to create a custom installation. In addition, the Arch Build System (ABS) provides a way to easily build new packages, modify the configuration of stock packages, and share these packages with other users via the Arch Linux user repository. »

elementary OS is a free, fast and aesthetically pleasing operating system based on Ubuntu .

Xubuntu is an elegant and easy-to-use operating system. Xubuntu comes with Xfce, which is a stable, light and configurable desktop environment.

Kali Linux is a Debian-derived Linux distribution designed for digital forensics and penetration testing, originally forked from Backtrack Linux by the Offensive Security team.

Kubuntu is an official "flavor" of Ubuntu that uses the KDE desktop environment instead of the default Unity . This gives it a completely different look and feel.

SliTaz GNU/Linux LiveCD operating system. "SliTaz is a free operating system, working completely in RAM and booting from removable media such as a cdrom or USB key. SliTaz is distributed as a LiveCD, and weighs less than 30MB. The system is quick and responsive, clean and robust. SliTaz is simple and intuitive, providing a lightweight, elegant desktop, detailed documentation and easy to use configuration tools."

KDE neon is a Kubuntu-based Linux distribution and live DVD featuring the latest KDE Plasma desktop and other KDE community software. Besides the installable DVD image, the project provides a rapidly-evolving software repository with all the latest KDE software. Two editions of the product are available - a "User" edition, designed for those interested in checking out the latest KDE software as it gets released, and a "Developer's" edition, created as a platform for testing cutting-edge KDE applications. »

Alpine Linux is a security-oriented, lightweight Linux distribution based on musl libc and busybox.

BackBox is a Linux distribution based on Ubuntu developed to perform penetration tests and security assessments. Designed to be fast, easy to use and to provide a minimal yet complete desktop environment thanks to its own software repositories always been updated to the last stable version of the most known and used ethical hacking tools.

BlackArch Linux is an Arch Linux -based distribution for penetration testers and security researchers. The repository contains 1218 tools. You can install tools individually or in groups. BlackArch Linux is compatible with existing Arch installs.

Edubuntu is an educational operating system that is a part of the Ubuntu family. It aims to make Ubuntu, the popular Linux-based operating system, a great choice for the computing needs of children, students, parents, teachers, and schools.

CrunchBang++ is an open source and completely free [of cost (#!++ does include several of Debian’s non-free packages as well as the non-free repository)] computer operating system, designed as a continuation of the CrunchBang Linux distribution, based on newer Debian 8 (Jessie) packages and built around the minimal and lightweight Openbox window manager.

Parrot Security OS (or ParrotSec) is a GNU/LINUX distribution based on Debian. It was built in order to perform penetration tests (computer security), Vulnerability Assessment and Mitigation, Computer Forensics and Anonymous Surfing.

BunsenLabs Linux is a distribution offering a light-weight and easily customizable Openbox desktop. The current release is Hydrogen, built on top of Debian Jessie. The project is a community continuation of CrunchBang Linux.

The most advanced, powerful and yet beautiful penetration testing distribution ever created.Lined up with ultimate collection of tools for pro Ethical Hackers and Cyber Security Experts.