BackTrack - Offensive Security company released the second respin BackTrack 4, specialized distribution based on Ubuntu, designed primarily for conducting penetration tests.

Description:
Release of BackTrack 4 R2 Nemesis is characterized by the rapid response of the working environment on the user's actions, improved hardware support, enhanced support for wireless cards, a simplified work environment. BackTrack features 4 R2 are the core of Linux 2.6.35.8 with significantly improved stack mac80211; support USB 3.0; superimposed patches of holding the wireless injections, maximum support for wireless attacks, completely redesigned Metasploit; updated page BackTrack Wiki, improved documentation and support.