Security Operating Systems

Kali Linux is an open-source, Debian-based Linux distribution aimed at advanced Penetration Testing and Security Auditing.

Parrot OS is a GNU/Linux distribution based on Debian and designed with security, development, and privacy in mind.

BlackArch Linux is an Arch Linux-based penetration testing distribution for penetration testers and security researchers.

Qubes OS is a security-focused desktop operating system that aims to provide security through isolation.

Tails is a portable operating system that protects against surveillance and censorship.

BackBox is an Ubuntu-based distribution developed to perform penetration tests and security assessments.

DEFT (Digital Evidence & Forensics Toolkit) Linux is a distribution made for computer forensics, ethical hacking, and penetration testing.

Pentoo is a security-focused livecd based on Gentoo Linux, designed for penetration testing and security assessment.

CAINE (Computer Aided INvestigative Environment) is an Italian Linux live distribution created as a digital forensics project.

Samurai Web Testing Framework is a live Linux environment that has been pre-configured to function as a web pen-testing environment.

NST is a Linux-based live CD that provides a set of open-source computer security and networking tools to perform routine security and networking diagnostic and monitoring tasks.

Fedora Security Lab provides a safe test environment to work on security auditing, forensics, system rescue and teaching security testing methodologies.

WEAKERTHAN Linux is a Debian-based distribution designed for penetration testing and ethical hacking, with a focus on wireless security.

Bugtraq is a Linux distribution oriented to digital forensics, malware analysis, and penetration testing.

ArchStrike is an Arch Linux-based distribution for security professionals and researchers, providing a large collection of security and penetration testing tools.