The Metasploit Project

The Metasploit Project: "The Metasploit Framework is an advanced open-source platform for developing, testing, and using exploit code. This release includes 18 exploits and 27 payloads; many of these exploits are either the only ones publicly available or just much more reliable than anything else out there. The Framework will run on any modern system that has a working Perl interpreter, the Windows installer includes a slimmed-down version of the Cygwin environment."