Guides by Lonely Planet - Explore city guides curated by experts.
Detour - Immersive audio walks, now in 17 cities
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
Lonely Planet - travel guide book publisher
Nexto - Replace boring audio guides with games & puzzles