Skyscanner - Skyscanner.com compares over 1000 airlines to find you the cheapest airfares, fast.
TripIt - TripIt is a travel app that creates a master itinerary to organize all of your plans for your vacation or work trip in one spot.
KAYAK - KAYAK is a travel search engine that searches hundreds of other travel sites at once. Our helpful tools & features find you the information you need to make the right decisions on flights, hotels, rental cars and vacation packages.
Sygic Travel Maps - Itinerary planner for independent travelers
Momondo - Find cheap flights with Momondo.
WorldMate - WorldMate is a travel app that helps individuals plan and organize trips. The app is available for Android and iOS mobile devices, and it is free to download and use.