HotelTonight Escape - The best getaway deals for tonight (or the weekend)
Guides by Lonely Planet - Explore city guides curated by experts.
MakCorps - Hotel Price Comparison API
Foursquare City Guide - Foursquare City Guide is a Free to use mobile application that will lead you to the perfect spot anytime anywhere around the world.
Hotellook - Compare hotel deals from all the leading booking agencies
Lonely Planet - travel guide book publisher