The best alternative to Nessus is SiteOne Crawler, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Nessus and seven of them are so hopefully you can find a suitable replacement. Other interesting alternatives to Nessus are Retestme, Probely, Pentest-Tools.com and PatrolServer.
A free in-depth website analyzer providing audits of security, performance, SEO, accessibility and other technical aspects. Available as a desktop application for Windows/macOS/Linux and as a CLI tool for advanced users and CI/CD processes. It also includes an offline web page exporter.
A cybersecurity service that provides hybrid penetration testing by combining AI automation with manual human expertise. Their core promise is "Zero False Positives," aiming to offer validated security intelligence rather than just automated scan results.
Probely is a top-tier cloud-based DAST Scanner designed for DevOps, empowering Security and Development teams to work together to secure their web applications and APIs.
We facilitate quick discovery and reporting of vulnerabilities in websites and network infrastructures, providing a set of powerful and tightly integrated pentesting tools that enable you to perform easier, faster, and more effective pentests.
Check realtime and continuously for outdated web software on your server. Delivered by mail and an easy to use dashboard and get notified if PHP, Apache, cPanel, Wordpress, Drupal and many more become outdated.
Yang is yet another Nikto GUI; Software for analyzing and securing your servers. Yang establish diagnostics on :
Protect your servers from IT vulnerabilities. Cyberwatch detects your vulnerabilities and deploys automatically the appropriate security fixes.
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