Detour - Immersive audio walks, now in 17 cities
VoiceMap - VoiceMap offers location-aware audio tours created by local storytellers. Tours can be downloaded to a mobile app and audio tracks automatically start playing triggered by GPS. VoiceMap also lets you sign up as storyteller and create your own tour.
Guides by Lonely Planet - Explore city guides curated by experts.
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.
Sygic Travel Maps - Itinerary planner for independent travelers
Mapline - Spreadsheets have never made you look so good. Sure, you can buy an expensive business intelligence mapping software that requires a Ph. D to use. Or you can use Mapline to create a map from Excel spreadsheet data in seconds.