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.
Wanderlog - Collaborative travel planner with combined itinerary and map
Worldpackers - Exchange your skills for accommodation
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.