Wikivoyage - the free worldwide travel guide that anyone can edit.
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.
Wikitravel - This article is a Movie/TV Tour.
Gogobot - Your guide to the good life
Triptipedia - Triptipedia is a free collaborative encyclopedia of travel tips, where everyone can browse, save and share tips for better travel!
Foursquare - Foursquare is all about helping you find new ways to explore your city.