Top Alternatives to skipfish

Nmap is a free and open-source utility for network discovery and security auditing. It utilizes raw IP packets to determine what hosts are available on the network, what services (application name and version) those hosts are offering, what operating systems (and OS versions) they are running, what type of packet filters/firewalls are in use, and dozens of other characteristics. It is command-line driven, though official GUI versions are also available.

Zenmap is the official graphical user interface (GUI) for the powerful Nmap security scanner. It provides an easy-to-use interface for performing complex network scans, making Nmap's capabilities more accessible to a wider range of users, from beginners to experienced security professionals.

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 It performs comprehensive tests against web servers to detect dangerous files, outdated server versions, and version-specific problems.

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.

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.