Foursquare Trip Tips - Collect and share travel recommendations from friends.
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.
Wayward - Track and share your adventures
NetBuddy - Netbuddy is a virtual network operator for a mobile device.
Modern Atlas - Discover where to travel
Wikivoyage - the free worldwide travel guide that anyone can edit.