Cvent - Cvent's event management software provides event planners with a complete solution to increase event attendance and decrease event costs.
Loxi - Easily add an events calendar to any website.
EventMobi - EventMobi is an interactive mobile event app, audience response and engagement platform for conferences and trade shows.
Event Calendar App - A simple, easy to manage, way of displaying events
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Whenever - Casual calendar app for iOS