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The Nessus vulnerability scanner is the world-leader in active scanners, featuring high-speed discovery, configuration auditing, asset profiling, sensitive data discovery and vulnerability analysis of your security posture. Nessus scanners can be distributed throughout an entire enterprise, inside DMZs and across physically separate networks.

Audit your website security and web applications for SQL injection, Cross site scripting and other web vulnerabilities with Acunetix Web Security Scanner. Download Free Edition!

The Open Vulnerability Assessment System (OpenVAS) is a framework of several services and tools offering a comprehensive and powerful vulnerability scanning and vulnerability management solution.

Sucuri is the de facto standard in website malware monitoring and cleanup. You get hacked, get a virus or trojan, we clean up the mess! No need to worry about malware anymore.

webcheck.me Free online website scanner. Checks security, seo, performance and mail problems. Provides free snapshots (full-page, hi-quality), provides a basic spell check.