- Maltego: https://www.maltego.com/categories/osint/
- Free OSINT course: https://www.myosint.training/courses/introduction-to-osint?ref=f7428c
- Offensive OSINT: https://www.offensiveosint.io/
- Digital Forensics: https://thenerdinthehighcastle.wordpress.com/
- Tools and Resources: https://thecyberpost.com/open-source-intelligence-osint-tools/
- Youtube (Sofia Santos): https://www.youtube.com/@gralhix/videos