Metasploit took the security world by storm when it was released in 2004. No other new tool even broke into the top 15 of this list, yet Metasploit comes in at #5, ahead of many well-loved tools that have been developed for more than a decade. It is an advanced open-source platform for developing, testing, and using exploit code. The extensible model through which payloads, encoders, no-op generators, and exploits can be integrated has made it possible to use the Metasploit Framework as an outlet for cutting-edge exploitation research. It ships with hundreds of exploits, as you can see in their online exploit building demo. This makes writing your own exploits easier, and it certainly beats scouring the darkest corners of the Internet for illicit shellcode of dubious quality. Similar professional exploitation tools, such as Core Impact and Canvas already existed for wealthy users on all sides of the ethical spectrum. Metasploit simply brought this capability to the masses.
Metasploit provides useful information and tools for penetration testers, security researchers, and IDS signature developers. This project was created to provide information on exploit techniques and to create a functional knowledge base for exploit developers and security professionals. This tool is provided for legal security research and testing purposes only. Metasploit is an open source project managed by Rapid7.
To download Metasploit Framework 3.3.3 CLICK HERE