BackTrack

http://linux.softpedia.com/get/System/Operating-Systems/Linux-Distributions/BackTrack-9477.shtml
The highest rated and acclaimed Linux security distribution to date
BackTrack is a Linux-based penetration testing arsenal that aids security professionals in the ability to perform assessments in a purely native environment dedicated to hacking. Regardless if you’re making BackTrack your primary operating system, booting from a LiveDVD, or using your favorite thumbdrive, BackTrack has been customized down to every package, kernel configuration, script and patch solely for the purpose of the penetration tester.
BackTrack is intended for all audiences from the most savvy security professionals to early newcomers to the information security field. BackTrack promotes a quick and easy way to find and update the largest database of security tool collection to-date.
Our community of users range from skilled penetration testers in the information security field, government entities, information technology, security enthusiasts, and individuals new to the security community. Feedback from all industries and skill levels allows us to truly develop a solution that is tailored towards everyone and far exceeds anything ever developed both commercially and freely available.
Whether you’re hacking wireless, exploiting servers, learning, performing a web application assessment, or social-engineering a client, BackTrack is the one-stop-shop for all of your security needs.
The evolution of BackTrack spans many years of development, penetration tests, and unprecedented help from the security community. BackTrack originally started with earlier versions of live Linux distributions called Whoppix, IWHAX, and Auditor. When BackTrack was developed, it was designed and developed by seasoned security professionals to perform penetration testing from one live CD and not leave remnants of the on the laptop itself. It has since expanded to being the most widely adopted penetration testing framework in existence and is used by the security community all over the world.
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What's New in This Release: [ read full changelog ]
· After months of development, bug fixes, upgrades, and the addition of 42 new tools, we are happy to announce the full release of BackTrack 5 R2 available for download now. Running our custom-built 3.2.6 kernel with the best wireless support available, this is our fastest and best release of BackTrack yet. In the past few weeks, we have had a flood of submissions to our BackTrack Redmine Tracker with submissions for many new tools and dozens of packages that needed to be updated and this has helped to make this one of the strongest releases we’ve ever had.
· Once again, our good friends over at Paterva have created a special BackTrack edition of Maltego 3.1.0 for your data mining pleasure and we have also included their recently-released CaseFile tool to help you organize and collate data from numerous sources. If you have never used these tools before, you really need to…they will change the way your interact with data and conduct reconnaissance.
· You will also find we have included Metasploit 4.2.0 Community Edition, version 3.0 of the Social Engineer Toolkit, BeEF 0.4.3.2, and many other tool upgrades too numerous to mention.