HyperTrack - Build logistics apps that feel like the future
Drupe - Next generation contact manager and dialer.
ipstack - ipstack is a free, real-time IP address to location JSON API and database service supporting IPv4 and IPv6 lookup.
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
LocationAPI - Instantly locate any device w/ WiFi, celltowers & IP address
Google Contacts - Google Contacts is Google's contact management tool that is available in its free email service Gmail, as a standalone service, and as a part of Google's business-oriented suite of web apps Google Apps.