Top Alternatives to Acunetix

Nessus Professional is a widely-used vulnerability scanner by Tenable, designed to identify security vulnerabilities in a variety of systems nationwide. It helps organizations manage their security posture by providing comprehensive scans, detailed reporting, and integration with other tools for remediation.

Nikto is a powerful and widely-used open-source web server scanner designed to identify potential security vulnerabilities and misconfigurations. It performs comprehensive tests against web servers to detect dangerous files, outdated server versions, and version-specific problems.

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.

Zed Attack Proxy (ZAP) is a free and open-source web application security scanner. It helps developers and penetration testers find security vulnerabilities in web applications during the development and testing phases.