AirWander - Add multi-day stopovers to save on flights
Wikivoyage - the free worldwide travel guide that anyone can edit.
Flymble LIVE - Book a flight for 1/10 of the cost upfront.
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.
Lonely Planet - travel guide book publisher
Triptipedia - Triptipedia is a free collaborative encyclopedia of travel tips, where everyone can browse, save and share tips for better travel!