BeWelcome - Open your door to the world!
Wanderlog - Collaborative travel planner with combined itinerary and map
Hospitality Club - Free network of people around the world who offer free accommodation, advice and help when they are traveling - hospitality exchange. Free membership.
Travel to Live - Live to travel. Travel to Live!
Worldpackers - Exchange your skills for accommodation
Tutterfly CRM - TutterflyCRM is what every travel agency owner dreams of.