Wikivoyage - the free worldwide travel guide that anyone can edit.
Journyal - Journyal helps you to automatically record your travels, be it backpacking trips, hikes, overseas travel, or even food trails. Simply press start and take photos as you would along the way, and Journyal will help you keep track of everything.
Triptipedia - Triptipedia is a free collaborative encyclopedia of travel tips, where everyone can browse, save and share tips for better travel!
Tripcast - A living travel journal for your friends back home.
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.
Firef.ly - An app that's your local guide and intimate travel journal.