Sqreen automatically instruments Rails Applications to diagnose security vulnerabilities and brings protection logic as security issues occur. The installation doesn't require any change in the code. Sqreen currently supports most security breaches, including SQL injection, cross site scripting, code/command/file injections, cryptographic weaknesses, etc.
The platform constantly improves transparently, thanks to machine learning capabilities applied on rules and attacks sourced from the community. The dashboard displays the security events triggered within the applications, with several monitoring and notification features.
via BetaList http://bitly.com/1Uv5uRQ
by Robert Hughey (Google+)