- https://github.com/BishopFox/GitGot
- https://www.threatcrowd.org/
- https://snyk.io/
- https://urlscan.io/
- https://securityheaders.com/
- https://xsshunter.com/
- https://overthewire.org/
- https://hackthebox.eu/
- https://pwnable.tw/
- https://www.root-me.org/
- https://www.hackthissite.org/
- https://www.vulnhub.com/
- https://www.wechall.net/
- https://www.cybrary.it/
- https://github.com/jivoi/awesome-osint
- https://start.me/p/wMdQMQ/tools
- https://start.me/p/m6XQ08/osint
- https://github.com/techgaun/github-dorks
- https://www.exploit-db.com/google-hacking-database/
- https://github.com/sa7mon/S3Scanner
- https://github.com/aboul3la/Sublist3r/
- https://zeltser.com/lookup-malicious-websites/
- https://www.virustotal.com/ - Analyze suspicious files and urls
- https://sploitus.com/ - Exploit and Tool Search
- https://censys.io/
- https://www.shodan.io/
- https://haveibeenpwned.com/
- https://ipalyzer.com/
- https://urlscan.io/
- https://securityheaders.com/
- https://observatory.mozilla.org/
- https://transparencyreport.google.com/safe-browsing/search
- https://viz.greynoise.io/
- https://www.hunch.ly/
- https://www.osintcombine.com/
- https://hacker101.com/
- https://www.bugcrowd.com
- https://www.bugcrowd.com/university
- https://www.hackerone.com/
- https://hackenproof.com/
- https://bughunter.withgoogle.com/
- https://www.microsoft.com/en-us/msrc/bounty
- https://www.facebook.com/whitehat
- https://www.facebook.com/bugbounty
- https://aws.amazon.com/security/vulnerability-reporting/
(https://www.criminalip.io/ - Criminal IP is a specialized Cyber Threat Intelligence (CTI) search engine that allows users to search for various security-related information such as malicious IP addresses, domains, banners, etc. It can be widely integrated)