Whenever - Casual calendar app for iOS
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Avenue - Event messaging app for WWDC attendees
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.
Ticket Tailor - Ticket Tailor is an easy-to-use event ticketing platform that allows event organizers of all shapes and sizes to sell tickets online.