Airbnb - Book unique places to stay and things to do.
BeWelcome - Open your door to the world!
Travel to Live - Live to travel. Travel to Live!
Trustroots - Travellers community for sharing, hosting and getting people together.
TripIt - TripIt is a travel app that creates a master itinerary to organize all of your plans for your vacation or work trip in one spot.
Couchsurfing - CouchSurfing is your ticket to explore the world -- from the road or from your own home.