Metasploit – learn it and love it
The Metasploit™ framework is incredible. It offers penetration testers a wide variety of tools in a friendly, easy to use manner. It was originally created by HD Moore and has been purchased by Rapid7, the creators of the Nexpose vulnerability scanner toolkit. Everything that we have done manually can be done with Metasploit.
If you are new to penetration testing, I highly recommend that you go through the free training provided at http://www.offensive-security.com/metasploit-unleashed/Metasploit_Unleashed_Information_Security_Training to get a really good grasp of how powerful this framework really is. This site is constantly updated and should be visited frequently to find information about the latest additions ...