Whoisology - Connected database of whois records and whois history
TEQNIX.io - Online Penetration testing tools and automations
WhoisThisDomain - Domain name lookup tool that allows you to get information about domain registration from WHOIS server.
SmartScanner - SmartScanner is an AI-powered web vulnerability scanner for testing security of web sites and applications
JSON WHOIS API - Parsed domain WHOIS data from any WHOIS server via RESTful API with metered pay as you pricing.
SecApps - Find security vulnerabilities right from your browser.