BeWelcome - Open your door to the world!
Trustroots - Travellers community for sharing, hosting and getting people together.
How I Travel - Meet the world's most interesting travelers.
Couchsurfing - CouchSurfing is your ticket to explore the world -- from the road or from your own home.
Airbnb for iPad - A new design experience for travelers and hosts
Worldpackers - Exchange your skills for accommodation