• Nessus– this tool can be used to scan configuration settings, patches, and networks etc. it can be found at https://www.tenable.com/products/nessus
• NMap. This tool can be used to monitor hosts that are running on the server and the services that they are utilizing. It can also be used to scan for ports. It can be found at https://nmap.org/
• SARA – SARA is the acronym for Security Auditor’s Research Assistant. As the name implies, this tool can be used to audit networks against threats such as SQL Injection, XSS etc. it can be found at https://www-arc.com/sara/sara.html

The above list is not exhaustive; it gives you an idea of the tools available for hacking Linux systems.