LocationAPI - Instantly locate any device w/ WiFi, celltowers & IP address
Foursquare - Foursquare is all about helping you find new ways to explore your city.
Companion - Never walk home alone
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.
Iris - The fastest web framework for Go in (THIS) earth
Yellow Pages - YP.com local search connects you with over 19 million local businesses.