Foursquare - Foursquare is all about helping you find new ways to explore your city.
Flamp - Reviews of companies in your city.
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.
Yellow Pages - YP.com local search connects you with over 19 million local businesses.
Angie's List - Fair price, quality service, and that stripes are always in season.
Wikipronto.com - POI Database - The application allow people to submit, edit and adopt point of interest (POI).