Hotels.com - Hotels.com is an online accommodation service that provides an interactive hotel booking experience.
Booking.com - Find your next stay. Search deals on hotels, homes, and much more...
Hostelz.com - The only complete guide to hostels worldwide, with real reviews and instant online booking.
Airbnb - Book unique places to stay and things to do.
Agoda - Smarter hotel booking just got smarter.
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.