Couchers.org - The new alternative to Couchsurfing. Non-profit. Community-focused. Well built.
Travel Butler (iOS) - Knows what to pack, where to eat and what to see
Trustroots - Travellers community for sharing, hosting and getting people together.
Tabiko - A chat-based concierge app for traveling in Japan
Couchsurfing - CouchSurfing is your ticket to explore the world -- from the road or from your own home.
Menu In Pictures - A crowdsourced map for restaurant menus