Livingsocial - Find 50% off restaurant offers.
Foodspotting - Focuses on specific dishes with user generated recommendations.
Where To? - Enables user to locate almost anything nearby, including the nearest ATM, burger joint, and medical provider. 
WhatsApp Messenger - Provides the ability to send data (including pictures, videos, sound clips, and GPS tags as well as text) via Wi-Fi for free to people anywhere in the world.
Seatguru - Shows the best seats on every plane and where power ports are located.
FlightAware - Track your flight by entering your airline and flight number and receive updates on flight delays, gate changes, and/or cancellations.
Knapsack - Plan your trip and later share memories.
Perfect World Clock - Provides easy access to the time in hundreds of cities adding several clocks as home screen widgets.
Tripit - Combine all your travel reservations in a single locations.
Dineoutcheap - Gives diners a fast and easy way to find deals.
Ski & Snow Report - Get the latest ski reports with detailed trail maps.
Tipulator - Makes tipping easy even with split bills.
Passbook - Passbook is an application in Apple’s iOS that allows users to store coupons, boarding passes, event tickets, store cards, generic cards, and other forms of mobile payment.
EHU - Helps campers and caravanners keep track of the electrical output of their assorted travel gadgets to avoid overloading the circuit.
PhotoSynth - Enables users to take awe inspiring panoramic pictures in an instant and is fully integrated with Facebook.