Hearst Castle App - Your personal, mobile tour guide
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.
YourTour - Explore user-generated immersive audio tours via your phone
Sygic Maps - The world's first online maps designed for travelers
Tales & Tours - The personal tour guide that fits in your pocket
Flamyngo - Create a city guide with help of your friends.