Back track which is the special version of linux operating system is used for the programmers,developers and mainly for those who are related for network securitis. Back track stands in first position for top penetration testing distribution. 
Here are the list of some of the awesome tools available in BackTrack 5r3 (the latest release).
To identify Live Hosts:dnmap – Distributed NMapaddress6 – (which acts as a IPV6 address conversion)
Information Gathering Analysis (Social Engineering)Jigsaw – Grabs information about company employeesUberharvest – Email harvestersslcaudit – SSL Cert auditVoIP honey – VoIP Honeypoturlcrazy – Detects URL typos used in typo squatting, url hijacking, phishing
Web CrawlersApache_users – Apache username enumeratorDeblaze – Performs enumeration and interrogation against Flash remote end points
Database AnalysisTnscmd10g – Allows you to inject commands into OracleBBQSQL – Blind SQL injection toolkit* If you are interested in Database Security see our Hacker Halted summary here.
Bluetooth AnalysisBlueranger – Uses link quality to locate Bluetooth devices
Vulnerability AssessmentLynis – Scans systems & software for security issuesDotDotPwn – Directory Traversal fuzzer
Exploitation ToolsNetgear-telnetable – Enables Telnet console on Netgear devicesTerminator – Smart Meter testerHtexploit – Tool to bypass standard directory protectionJboss-Autopwn – Deploys JSP shell on target JBoss serversWebsploit – Scans & analyses remote systems for vulnerabilities
Wireless Exploitation ToolsBluepot – Bluetooth honeypotSpooftooph – Spoofs or clones Bluetooth devicesSmartphone-Pentest-FrameworkFern-Wifi-cracker – Gui for testing Wireless encryption strengthWi-fihoney – Creates fake APs using all encryption and monitors with AirodumpWifite – Automated wireless auditor
Password ToolsCreddumpJohnnyManglefizzOphcrackPhrasendresherRainbowcrackAccchecksmbexec
you can read more about the backtrack by clicking here click here
