Metasploit

Metasploit Community Edition simplifies network discovery and vulnerability verification for specific exploits, increasing the effectiveness of vulnerability scanners such as Nexpose - for free.

Free Personal Windows Linux BSD

Social-Engineer Toolkit

The Social-Engineer Toolkit is an open source penetration testing framework designed for social engineering. SET has a number of custom attack vectors that allow you to make a believable attack quickly.

Free Open Source Mac OS X Linux Python