HotelTonight Escape - The best getaway deals for tonight (or the weekend)
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.
MakCorps - Hotel Price Comparison API
NetBuddy - Netbuddy is a virtual network operator for a mobile device.
Hopper - Hopper is the #1 most downloaded travel app in North America! We aspire to be the world’s best — and most fun — place to book travel.
Wikivoyage - the free worldwide travel guide that anyone can edit.