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Guestboard - Lead powerfully-organized group events with Guestboard – a modular event platform that gives groups of 10-1000+ people a central space to coordinate, build excitement, and save money. No more crazy email threads. No more massive group texts.
Mobilizon - A free and federated tool to get our events off Facebook
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Get Together - Get Together is an open source event manager for local communities.
Punchbowl - A party planning and greeting card website
And Chill - andchill is a new way of enjoying movies and videos with your friends.