Magpie - Female travelers club - meet women like you when you travel

Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

Travel Diaries - Create your own travel diary to capture your experiences

emble - Plan better events with your friends

tripcake - Doodle for travel plans with friends

Raft Calendar - A fun and beautiful calendar for couples and close friends