Wiki hilsz.com: Metasploit

http://www.metasploit.com

http://en.wikipedia.org/wiki/Metasploit

http://hakin9.org/metasploit-tutorials-hacking-exploiting-software-compedium

http://www.networkworld.com/article/2944811/network-security/8-penetration-testing-tools-that-will-do-the-job.html
http://www.theregister.co.uk/2015/05/05/rapid7_buys_web_app_security_firm_nto

http://www.eweek.com/security/wannacry-ransomware-worm-risk-continues-as-exploit-lands-in-metasploit