1. Blackbuntu

Blackbuntu is distribution for penetration testing which was specially designed for security training students and practitioners of information security.

Blackbuntu is Ubuntu base distro for Penetration Testing with GNOME Desktop Environment. It’s currently being built using the Ubuntu 10.10 and work on reference Back|Track.

Blackbuntu features the following upstream components: Ubuntu 10.10, Linux 2.6.35 and Gnome 2.32.0

System requirements

1GHz x86 processor
768 MB of system memory (RAM)
10 GB of disk space for installation
Graphics card capable of 800×600 resolution
DVD-ROM drive or USB port

You can download it from here

2. DEFT 6.1

DEFT Linux 6 is based on the new Kernel 2.6.35 (Linux side) and the DEFT Extra 3.0 (Computer Forensic GUI) with the best freeware Windows Computer Forensic tools. DEFT it’s a new concept of Computer Forensic live system that use LXDE as desktop environment and WINE for execute Windows tools under Linux and mount manager as tool for device management.

It is a very easy to use system that includes an excellent hardware detection and the best free and open source applications dedicated to incident response and computer forensics.
DEFT is meant to be used by:
police
investigators
system administrator
individuals
and all the people who need to use forensic tool but don’t know the open source operative systems and the Forensic techniques.

You can download it from here

3. BackBox Linux

BackBox is a Linux distribution based on Ubuntu Lucid 10.04 LTS 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.

You can download it from here

And of course the standard 🙂
4. Backtrack 4 R2 – Nemesis

Yes, the time has come again – for a new kernel, and a new release of BackTrack. Codenamed “Nemesis”. This release is our finest release as of yet with faster Desktop responsiveness, better hardware support, broader wireless card support, streamlined work environment.

We could go on for pages on saying how great the new version is, but we’ll cut to the chase, and give you the run down:

* Kernel 2.6.35.8 – *Much* improved mac80211 stack.
* USB 3.0 support.
* New wireless cards supported.
* All wireless Injection patches applied, maximum support for wireless attacks.
* Even *faster* desktop environment.
* Revamped Fluxbox environment for the KDE challenged.
* Metasploit rebuilt from scratch, MySQL db_drivers working out of the box.
* Updated old packages, added new ones, and removed obsolete ones.
* New BackTrack Wiki with better documentation and support.
* Our most professional, tested and streamlined release ever.

You can download it from here

If there is a distro I missed please leave a comment. The ones I listed above have great support please dont submit dead projects.