HTTPCS Security VS ZoomEye

Acunetix - Audit your website security and web applications for SQL injection, Cross site scripting and other...

Shodan - Shodan is the world's first search engine for Internet-connected devices.

Horangi - Horangi is a leading cyber-security solution that provides instant response and threat detection for companies who lack the time and expertise to monitor their system.

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.