Backbox v5.1  [ Free | 2.2 GB ]

BackBox Linux is a penetration testing and security assessment oriented Linux distribution providing a network and systems analysis toolkit. It includes some of the most commonly known/used security and analysis tools, aiming for a wide spread of goals, ranging from web application analysis to network analysis, stress tests, sniffing, vulnerability assessment, computer forensic analysis, automotive and exploitation.
Blackbuntu v0.3  [ Free | 3.9 GB ]

Blackbuntu is a penetration testing Linux distribution which is specially designed for training security students and information security practitioners. It is currently built on Ubuntu 10.10 with the Gnome desktop environment. Blackbuntu will also include the KDE desktop in the final release of Blackbuntu Community Edition 0.3. It is not included in 0.1, 0.2 or the current 0.3 betas.
Blackarch  [ Free | 7.5 GB ]

BlackArch Linux is an Arch Linux-based penetration testing distribution for penetration testers and security researchers. The repository contains 1950 tools. You can install tools individually or in groups. BlackArch Linux is compatible with existing Arch installs. For more information, see the installation instructions. Also, news is published on our blog.
Bugtraq v2  [ Free | 3.5 GB ]

Bugtraq system offers the most comprehensive, optimal, and stable with automated services manager in real time distribution. This distribution based on the 3.2 and 3.4 kernel Generic available in 64 Bits has a huge range of penetration, forensic and laboratory tools. The systems are available in 11 different languages.
Cyborg-Hawk-Linux v1.1  [ Free | 3.1 GB ]

Exploitation Toolkit
Toolkit to test the integrity of your IT Infrastructure.Best exploit of for best results
Stress Testing
Determine the amount of stress your computer, network, program or device can bear.
Reverse Engineering
Reversing the core code for the analysis by going backwards through the development cycle.
Deftlinux v8.2  [ Free | 3.3 GB ]

DEFT is a household name when it comes to digital forensics and intelligence activities since its first release way back in 2005. The Linux distribution DEFT is made up of a GNU/Linux and DART(Digital Advanced Response Toolkit), a suite dedicated to digital forensics and intelligence activities. DEFT is touted as a top choice among security and law enforcement agencies for the computer forensic investigations. But what makes DEFT such a capable distro? Let’s take a look.
DracOS v3.0  [ Free | 2.5 GB ]

Lightweight and Powerful Penetration Testing OS
Dracos Linux is an open source operating system provides to penetration testing. Packed with a ton of pentest tools including information gathering, forensics, malware analysis, mantaining access, and reverse engineering.
GnackTrack v6  [ Free | 2 GB ]

GnackTrack is a Live (and installable) Linux distribution designed for Penetration Testing and is based on Ubuntu. Although this sounds like BackTrack, it is most certainly not; it's very similar but based on the much loved GNOME!
Kali Linux  [ Free | 2.9 GB ]

Kali Linux “Live” has two options in the default boot menu which enable persistence - the preservation of data on the “Kali Live” USB drive - across reboots of “Kali Live”. This can be an extremely useful enhancement, and enables you to retain documents, collected testing results, configurations, etc., when running Kali Linux “Live” from the USB drive, even across different systems. The persistent data is stored in its own partition on the USB drive, which can also be optionally LUKS-encrypted.
Knoppix-STD v7.2  [ Free | 0.7 GB ]

The Knoppix CD and DVD include recent Linux software and desktop environments. The DVD includes programs such as, Abiword, The Gimp, Konqueror, Mozilla, Apache, PHP, MySQL and hundreds of other quality open source programs. Knoppix is suitable even for Linux beginners and we encourage you to try it and use the extensive help on our site if you need it. If you would like to learn more about Knoppix, you could look at the FAQs and Documentation, discuss it in the Forum, or just try it out!
Live hacking v1.3  [ Free | 1 GB ]

Live Hacking CD is a new Linux distribution packed with tools and utilities for ethical hacking, penetration testing and countermeasure verification.
Matriux Linux OS v3  [ Free | 3.3 GB ]

The Matriux is a phenomenon that was waiting to happen. It is a fully featured security distribution based on Debian consisting of a powerful bunch of more than 300 open source and free tools that can be used for various purposes including, but not limited to, penetration testing, ethical hacking, system and network administration, cyber forensics investigations, security testing, vulnerability analysis, and much more. It is a distribution designed for security enthusiasts and professionals, although it can be used normally as your default desktop system.
Nodezero  [ Free | 1.8 GB ]

NodeZero is Ubuntu based linux designed as a complete system which can also be used for penetration testing. NodeZero uses Ubuntu repositories so your system will be always up to date.
Parrot OS Security v3.11  [ Free | 3.7 GB  ]

The Parrot System
Parrot is a GNU/Linux distribution based on Debian Testing and designed with Security, Development and Privacy in mind.
It includes a full portable laboratory for security and digital forensics experts, but it also includes all you need to develop your own software or protect your privacy while surfing the net.
Pentoo v6.3  [ Free | 3.2 GB ]

Pentoo is a security-focused livecd based on Gentoo
It's basically a gentoo install with lots of customized tools, customized kernel, and much more. Here is a non-exhaustive list of the features currently included :
Hardened Kernel with aufs patches
Backported Wifi stack from latest stable kernel release
Module loading support ala slax
Changes saving on usb stick
Samuraiwtf v3.2  [ Free | 4.8 GB ]

The Samurai Web Testing Framework is a virtual machine, supported on VirtualBox and VMWare, that has been pre-configured to function as a web pen-testing environment. The VM contains the best of the open source and free tools that focus on testing and attacking websites. In developing this environment, we have based our tool selection on the tools we use in our security practice. We have included the tools used in all four steps of a web pen-test.
Weakerth4n v1.9  [ Free | 2 GB ]

Weakerth4n has a very well maintained website and a devoted community. Built from Debian Squeeze (Fluxbox within a desktop environment) this operating system is particularly suited for WiFi hacking as it contains plenty of Wireless cracking and hacking tools. Tools includes: Wifi attacks, SQL Hacking, Cisco Exploitation, Password Cracking, Web Hacking, Bluetooth, VoIP Hacking, Social Engineering, Information Gathering, Fuzzing Android Hacking, Networking and creating Shells.
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