Wikivoyage - the free worldwide travel guide that anyone can edit.
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.
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.
Journy - Tastemaker-driven concierge to plan your perfect trip
WikiOverland - WikiOverland is the community encyclopedia of Overland Travel.
Flamyngo - Create a city guide with help of your friends.