From gbhackers.com
BackBox Linux is a free Open Source penetration testing and security assessment oriented Linux distribution providing a network and systems analysis toolkit.
It has been developed to perform penetration tests and security assessments. Designed to be fast, easy to use and provide a minimal yet complete desktop environment
BackBox Linux includes some of the most commonly known/used security and analysis tools, aiming for a wide spread of goals, ranging from web application analysis to network analysis, stress tests, sniffing, vulnerability assessment, computer forensic analysis, automotive and exploitation.
It has been built on Ubuntu core system yet fully customized, designed to be one of the best Penetration testing and security distribution and more.