w3af - w3af is a Web Application Attack and Audit Framework

SearchDiggity - SearchDiggity is the primary attack tool of the Google Hacking Diggity Project.

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

OWASP Amass - An advanced open source tool to help information security professionals perform network mapping of attack surfaces and external asset discovery using open source information gathering and active reconnaissance techniques!

Zed Attack Proxy - The Zed Attack Proxy (ZAP) is an easy to use integrated penetration testing tool for finding...

Spyse - A search engine which collects, processes, and provides structured information about network...