Mixily - Hosting your event just got easier.
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Social Tables - Social Tables leading event diagramming, seating, design and check-in products provide innovative solutions to handle your complex problems.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Roll - Roll offers Xero integrated web-based business management and visibility software for services-based businesses.
Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.