Metasploit is an open source security and penetration testing framework that allows users to evaluate the security of a computer system or network. It can be used to audit the security of a system or to detect and exploit vulnerabilities. Metasploit contains numerous exploits, payloads, encoders, evasion techniques, and other tools which can be used to test a system's security. It can be used to test the security of web applications, databases, network services, and other components of a network. It can also be used to create and launch exploits against vulnerable systems. Metasploit also includes a set of modules which can be used to perform various tasks such as collecting information, scanning for vulnerabilities, and launching attacks. Furthermore, the Metasploit framework can be integrated with other tools such as Nmap and Nessus for more comprehensive security testing.
Nessus looks for vulnerabilities, Metasploit exploits vulnerabilities. I guess the prices are similar although ...