sn0int - sn0int is a semi-automatic OSINT framework and package manager
Blackbird OSINT - An OSINT tool to search for accounts by username in social networks.
SpiderFoot - Open source intelligence (OSINT) automation tool.
PhoneInfoga - Information gathering & OSINT framework for phone numbers - GitHub - sundowndev/phoneinfoga: Information gathering & OSINT framework for phone numbers
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!