GRC Port Scan - GRC Internet Security Port Scanner. Tests for open ports on your external IP address.

Webroot Business End - Webroot Business End is an endpoint security service that uses a machine-learning algorithm that identifies and blocks malicious content such as phishing pages, ransomware, and malicious downloads before it can compromise endpoints.

My Public IP - My Public IP is a utility to let you know through which internet IP the world see you.

TEQNIX.io - Online Penetration testing tools and automations

whatismyip.cc - External IP Address lookup tool with option to scan the external IP address.

SecApps - Find security vulnerabilities right from your browser.