Shodan - Shodan is the world's first search engine for Internet-connected devices.
HackerOne - HackerOne provides a platform designed to streamline vulnerability coordination and bug bounty program by enlisting hackers.
Censys - Censys helps organizations, individuals, and researchers find and monitor every server on the Internet to reduce exposure and improve security.
Acunetix - Audit your website security and web applications for SQL injection, Cross site scripting and other...
Exploit Pack - Exploit Pack is an open source project security that will help you adapt exploit codes on-the-fly.
Forcepoint Web Security Suite - Internet Security