This excellent bootable live CD Linux distribution comes from the merger of Whax and Auditor. It boasts a huge variety of Security and Forensics tools and provides a rich development environment. User modularity is emphasized so the distribution can be easily customized by the user to include personal scripts, additional tools, customized kernels, etc. BackTrack is succeeded by Kali Linux.
For downloads and more information,
visit the BackTrack homepage.
Excellent set of tools! For the first few days you'll think you found the FINAL OS solution. Then I discovered that almost all the tools had problems: missing scripts, older unsupported versions, no documentation included. Got metasploit working after updating at the source. Never got the dist to install on a hard disk, USB, or SD card after 28 attempts! (yes I counted them) Was told be tech support that most people only run it from the dist cd. My suggestion is to run this OS to learn about alot of pen-testing tools at once, then add your favorites to your preferred Linux dist. (I did have alot of fun with it ;^)
Way too buggy and spend all day fixing it and has tons of broken tools. Check out Gh0st_OS made by Gh0std0g it's about 10x better and more stable plus it's foundation is Ubuntu 12.04. you'll thanks me later : )