HyperTrack - Build logistics apps that feel like the future
Foursquare - Foursquare is all about helping you find new ways to explore your city.
ipstack - ipstack is a free, real-time IP address to location JSON API and database service supporting IPv4 and IPv6 lookup.
Tripadvisor - The Tripadvisor mobile app is available for the Android and iOS platforms. It can be used to create reviews of hotels, restaurants, and to chat with other travelers on Tripadvisor forums.
LocationAPI - Instantly locate any device w/ WiFi, celltowers & IP address
Yellow Pages - YP.com local search connects you with over 19 million local businesses.