Planmesh - The easiest way to plan with friends
Raft Calendar - A fun and beautiful calendar for couples and close friends
Travel Diaries - Create your own travel diary to capture your experiences
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
RoomForTea - A female-friendly housing network in London, UK.
emble - Plan better events with your friends