Social Contract - Start your socially isolated social group
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Contracts Covered - Never lose a contract again
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Bonsai - One platform to streamline your entire business
Bigtent - BigTent is a web-based organization and communication portal for groups.