Gravity scan
Probe.ly
Marshal
Google Security Scanner
WebARX
Security Growler
SourceClear
CUJO
assertpy
grappa
Gravity scanProbe.ly - Intuitive and easy-to-use webapp vulnerability scanner
grappa - grappa is an declarative, verbose, and expressive assertion library for Python.
Marshal - Quickly scan your cloud for exposed sensitive information.
Google Security Scanner - Allows developers to scan their apps for vulnerabilities
WebARX - Website Protection, Managed Website Security & Website Monitoring
Security Growler - Menubar app which notify when various security events occur