SpiderFoot - Open source intelligence (OSINT) automation tool.
Datasploit - An #OSINT Framework to perform various recon techniques on Companies, People, Phone Number, Bitcoin Addresses, etc., aggregate all the raw data, and give data in multiple formats. - DataSploit/dat...
sn0int - sn0int is a semi-automatic OSINT framework and package manager
Maltego - Maltego is an open source intelligence and forensics application.
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!
Sublist3r - Sublist3r is a python tool designed to enumerate subdomains of websites using OSINT.