EventsBase - Find the best professional events nearby or globally
Cvent - Cvent's event management software provides event planners with a complete solution to increase event attendance and decrease event costs.
Rally by Eventbrite - Find the best local events and rally your friends to join
Eventzilla - Eventzilla lets you sell tickets online and manage attendees from one integrated application.
Calendall - Follow the best events online, without leaving your couch.
Attendify - Develop relationships at the events that you attend by creating smaller events with just a few people.