Mapple.me - Mapple.me bridges the gap between available time and availability of friends to increase social...
BeWelcome - Open your door to the world!
Foursquare - Foursquare is all about helping you find new ways to explore your city.
Trustroots - Travellers community for sharing, hosting and getting people together.
LockOnMe - LockOnMe is a location-sharing app, displaying targets and associated Points Of Interest on maps & fun radars.
Hospitality Club - Free network of people around the world who offer free accommodation, advice and help when they are traveling - hospitality exchange. Free membership.