BackTrack is the most Top rated linux live distribution focused on penetration testing. With no installation whatsoever, the analysis platform is started directly from the CD-Rom and is fully accessible within minutes.
It's evolved from the merge of the two wide spread distributions - Whax and Auditor Security Collection. By joining forces and replacing these distributions, BackTrack has gained massive popularity and was voted in 2006 as the #1 Security Live Distribution by insecure.org. Security professionals as well as new comers are using BackTrack as their favorite toolset all over the globe.
Because Metasploit is one of the key tools for most analysts it is tightly integrated into BackTrack and both projects collaborate together to always provide an on-the-edge implementation of Metasploit within the BackTrack CD-Rom images or the upcoming remote-exploit.org distributed and maintained virtualization images (like VMWare images appliances).
Currently BackTrack consists of more than 300 different up-to-date tools which are logically structured according to the work flow of security professionals. This structure allows even newcomers to find the related tools to a certain task to be accomplished. New technologies and testing techniques are merged into BackTrack as soon as possible to keep it up-to-date.
This live-CD Linux distribution truly has every tool you could imagine using for a security audit. There are 24 information gathering tools; 21 network mapping tools; 65 vulnerability identification tools; 11 penetration tools; 48 privilege escalation tools; 15 backdoors; a log cleaner; 29 wireless analysis tools; 7 VoIP analysis tools; 13 digital forensics tools; 7 reverse engineering tools; and the Snort IDS. Quite a collection!
The live-CD boots to a KDE desktop, with support for various ethernet NICs and wireless cards both natively and through ndiswrapper. The website even includes screenshots.
The current version is 141207 (12/14/2007 - Beta 3). MD5 checksums are available on the download page.