Sygic Travel Maps - Itinerary planner for independent travelers
Couchers.org - The new alternative to Couchsurfing. Non-profit. Community-focused. Well built.
TRAVO - Instantly create end-to-end trips around your events.
Couchsurfing - CouchSurfing is your ticket to explore the world -- from the road or from your own home.
Tripsy - Planning your trip has gotten much easier.
Hospitality Club - Free network of people around the world who offer free accommodation, advice and help when they are traveling - hospitality exchange. Free membership.