Detour - Immersive audio walks, now in 17 cities
Guides by Lonely Planet - Explore city guides curated by experts.
YourTour - Explore user-generated immersive audio tours via your phone
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.
Pretty Streets - Discover cities through customized walking itineraries
Lonely Planet - travel guide book publisher