SpiderFoot - Open source intelligence (OSINT) automation tool.
sn0int - sn0int is a semi-automatic OSINT framework and package manager
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...
Maltego - Maltego is an open source intelligence and forensics application.
Lampyre - Lampyre - an efficient data analysis and OSINT multi-tool for everyone.
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!