Watcher is a Web security testing tool and passive vulnerability scanner. This tool is in continues development and has updated it features and capabilities.
The Hacker News

Watcher is a runtime passive-analysis tool for HTTP-based Web applications. Being passive means it won't damage production systems, it's completely safe to use in Cloud computing, shared hosting, and dedicated hosting environments. Watcher detects Web-application security issues as well as operational configuration issues. Watcher provides pen-testers hot-spot detection for vulnerabilities, developers quick sanity checks, and auditors PCI compliance auditing. It looks for issues related to mashups, user-controlled payloads (potential XSS), cookies, comments, HTTP headers, SSL, Flash, Silverlight, referrer leaks, information disclosure, Unicode, and more.


Major Features:
  1. Passive detection of security, privacy, and PCI compliance issues in HTTP, HTML, Javascript, CSS, and development frameworks (e.g. ASP.NET, JavaServer)
  2. Works seamlessly with complex Web 2.0 applications while you drive the Web browser
  3. Non-intrusive, will not raise alarms or damage production sites
  4. Real-time analysis and reporting - findings are reported as they're found, exportable to XML, HTML, and Team Foundation Server (TFS)
  5. Configurable domains with wildcard support
  6. Extensible framework for adding new checks

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