Do you know what Metasploit is? Have you ever used it? Metasploit is one of the most useful penetration testing tool used by security specialists to look for vulnerabilities in a system. If you are a hacker, this is a must learn tool for you. If you are a penetration tester, this is a must have tool for you to find weaknesses in your own system and prevent hackers from entering. Metasploit works in both Windows and Linux, although i believe most of the users would be Windows, professionals often use Linux for this task. Visit their homepage here. Speaking of the word hacker, i was enlighten by one of my professors in my university few days back, let me write it out in a new post :).