Metasploit framework is a multipurpose tool that can be used for both network scanning and performing exploit testing. It is well-known for its ability to not only identify vulnerabilities but also to simulate attacks to see how the vulnerabilities could potentially be exploited. Nmap is primarily used for network discovery and security auditing but does not offer built-in functionalities for exploit testing. Wireshark is used for packet analysis and network troubleshooting rather than vulnerability scanning or exploit testing. OpenSSL is a software library for applications that secure communications over computer networks against eavesdropping, but it does not provide the scanning or exploit testing capabilities required for a comprehensive assessment.