The BackTrack distribution originated from the merger of two formerly competing distributions which focused on penetration testing:
WHAX: a Slax-based Linux distribution developed by Mati Aharoni, a security consultant. Earlier versions of WHAX were called Whoppix and were based on Knoppix.
Auditor Security Collection: a Live CD based on Knoppix developed by Max Moser which included over 300 tools organized in a user-friendly hierarchy.
On January 9, 2010, BackTrack 4 improved hardware support, and added official FluxBox support. The overlap with Auditor and WHAX in purpose and in collection of tools partly led to the merger. The overlap came about as Backtrack 5, released on May 10, 2011. This version also seen the base OS changed from Slackware to Ubuntu.
Tools
BackTrack provided users with easy access to a comprehensive and large collection of security-related tools ranging from port scanners to Security Audit. Support for Live CD and Live USB functionality allowed users to boot BackTrack directly from portable media without requiring installation, though permanent installation to hard disk and network was also an option.
BackTrack included many well known security tools including:
First stable release of BackTrack based on Slackware
October 13, 2006
BackTrack 2 beta #1 released
November 19, 2006
BackTrack 2 beta #2 released
March 6, 2007
BackTrack 2 final released
December 14, 2007
BackTrack 3 beta released
June 19, 2008
BackTrack 3 final released (Linux kernel 2.6.21.5)
February 11, 2009
BackTrack 4 beta released
January 9, 2010
BackTrack 4 final release (Linux kernel 2.6.30.9 and base OS changed to Ubuntu)
May 8, 2010
BackTrack 4 R1 release
November 22, 2010
BackTrack 4 R2 release
May 10, 2011
BackTrack 5 release (Linux kernel 2.6.38)
August 18, 2011
BackTrack 5 R1 release (Linux kernel 2.6.39.5)
March 1, 2012
BackTrack 5 R2 release (Linux kernel 3.2.6)
August 13, 2012
BackTrack 5 R3 release
Whenever a new version of BackTrack was released, older versions would lose their support and service from the BackTrack development team. There are currently no supported versions of BackTrack.