TEQNIX.io - Online Penetration testing tools and automations
GRC Port Scan - GRC Internet Security Port Scanner. Tests for open ports on your external IP address.
Zed Attack Proxy - The Zed Attack Proxy (ZAP) is an easy to use integrated penetration testing tool for finding...
whatismyip.cc - External IP Address lookup tool with option to scan the external IP address.
Shodan - Shodan is the world's first search engine for Internet-connected devices.
Skeebus - Skeebus is a macOS menu bar app that displays your current public IP address