ipinfo.io - Simple IP address information.
GRC Port Scan - GRC Internet Security Port Scanner. Tests for open ports on your external IP address.
ipdata.co - Get the Geolocation, Organisation, Currency, Timezone, Calling Code, Flag, Proxy, Tor and Threat intelligence data from any IPv4 or IPv6 address.
geoiplookup.net - (IPv4 only) Online tool to get accurate IP address information
ifconfig.co - What is my IP address? — The best tool to find your own IP address, and information about it.
whatismyip.cc - External IP Address lookup tool with option to scan the external IP address.