Wikivoyage - the free worldwide travel guide that anyone can edit.
Detour - Immersive audio walks, now in 17 cities
Triptipedia - Triptipedia is a free collaborative encyclopedia of travel tips, where everyone can browse, save and share tips for better travel!
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.
WeSideTrip - Directory of unique experiences from around the world