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!
SpiderFoot - Open source intelligence (OSINT) automation tool.
Spyse - A search engine which collects, processes, and provides structured information about network...
sn0int - sn0int is a semi-automatic OSINT framework and package manager
theHarvester OSINT Tool - theHarvester is a very simple, yet effective tool designed to be used in the early
Shodan - Shodan is the world's first search engine for Internet-connected devices.