Shodan - Shodan is the world's first search engine for Internet-connected devices.
Acunetix - Audit your website security and web applications for SQL injection, Cross site scripting and other...
Censys - Censys helps organizations, individuals, and researchers find and monitor every server on the Internet to reduce exposure and improve security.
PracticeProtect - Network security & identity management
Exploit Pack - Exploit Pack is an open source project security that will help you adapt exploit codes on-the-fly.
Intruder - Intruder is a security monitoring platform for internet-facing systems.