BuiltWith
Shows the technology stack behind a website; helpful for linking sites.
Check Phish (Bolster)
Free URL scanner that flags phishing and scam sites.
DNSTwist
Generates and checks lookalike domains for phishing and typosquat detection.
DomainTools
Enterprise domain and DNS intelligence with deep WHOIS history.
Google Safe Browsing Status
Checks whether Google currently flags a site as unsafe.
Phishtank
Community-verified phishing URL database.
URLScan.io
Sandbox that loads a URL and records requests, screenshots and indicators; great for phishing triage.
Wappalyzer
Browser extension identifying technologies used on websites.
Whoxy
WHOIS and reverse WHOIS search with historical records.
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