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

Calendify - Calendify is an event community where you can share, publish, and subscribe to event calendars. It helps you to stay informed about what you are interested in and what is yet to come.

Eventzilla - Eventzilla lets you sell tickets online and manage attendees from one integrated application.

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

Attendify - Develop relationships at the events that you attend by creating smaller events with just a few people.

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