Top Alternatives to Nessus

Metasploit is a powerful open-source penetration testing framework used by cybersecurity professionals to identify and exploit vulnerabilities in systems and applications. It provides a vast collection of exploits, payloads, and post-exploitation tools, facilitating comprehensive security assessments and ethical hacking operations.

Skipfish is a discontinued command-line web application security scanner known for its recursive crawling and heuristic detection capabilities. It's designed to quickly assess web applications for common vulnerabilities and security flaws.

Acunetix is a leading web vulnerability scanner designed to identify and report on security flaws within websites, web applications, and APIs. It helps organizations prevent data breaches and cyberattacks by providing comprehensive security testing capabilities.