ipstack - ipstack is a free, real-time IP address to location JSON API and database service supporting IPv4 and IPv6 lookup.
Hoodmaps - Crowdsourced neighborhood 🗺 maps to navigate a city 💫
ipapi - Web analytics with IP address lookup and location API
YouMap - The Human Atlas™
ipgeolocation.io - Free IP Geolocation API and Accurate GeoIP Lookup Location Database
Zenly - Zenly is a GPS tracker to locate your friends in realtime.