GRC Port Scan - GRC Internet Security Port Scanner. Tests for open ports on your external IP address.
ShowIP - ShowIP displays the IP address(es) of the current page in the status bar.
geoiplookup.net - (IPv4 only) Online tool to get accurate IP address information
whatismyip.cc - External IP Address lookup tool with option to scan the external IP address.
Geo IP Tool - Find a geolocation of an IP address including latitude, longitude, city, region and country.
IP-Toolbox.com - IP-Toolbox.com is the best site for quick and easy viewing of your public IP address and other related information.