Wikivoyage - the free worldwide travel guide that anyone can edit.
Airbnb - Book unique places to stay and things to do.
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.
June Homes - Rentals Redefined
Triptipedia - Triptipedia is a free collaborative encyclopedia of travel tips, where everyone can browse, save and share tips for better travel!
HomeToGo - HomeToGo is a search engine for vacation rentals worldwide.