whatismyip.cc - External IP Address lookup tool with option to scan the external IP address.
IP-Toolbox.com - IP-Toolbox.com is the best site for quick and easy viewing of your public IP address and other related information.
GRC Port Scan - GRC Internet Security Port Scanner. Tests for open ports on your external IP address.
What is my IP? - Find out what your IP is. Do not hesitate to open wimip.
TrueIP - TrueIP is a small program that runs in the system tray, monitoring your IP address(es).
Geo IP Tool - Find a geolocation of an IP address including latitude, longitude, city, region and country.