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

Eventbrite - Discover Great Events or Create Your Own & Sell Tickets

Splash - Anyone can create a Splash event, whether you're a company hosting a single event or an individual hosting a personal event like a birthday or wedding. Get Started for Free. Text goes here. X. Full Event Program.

Bigtent - BigTent is a web-based organization and communication portal for groups.

Cvent - Cvent's event management software provides event planners with a complete solution to increase event attendance and decrease event costs.

Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.