Fitbit has everything I need, the steps, the Heart Rate, it has all of my exercising modes, and it has a fair price. It has a rather simplistic User interface, which I really like to be honest. Highly recommened!
Foursquare - Foursquare is all about helping you find new ways to explore your city.
Strava - The #1 app for runners and cyclists
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.
Lose it! - Snap a photo of your food to get nutritional facts
Yellow Pages - YP.com local search connects you with over 19 million local businesses.
SmartHealth - SmartHealth is a health and fitness app that effectively monitors and records your sleep patterns and various health-related parameters such as heart rate, blood pressure, etc.