Event Calendar App - A simple, easy to manage, way of displaying events
Future - Calendar events around the clock
Zoho Backstage - Plan, run, and analyze your event— all from one place
Whenever - Casual calendar app for iOS
Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform
GetStream.io - APIs for the development of scalable newsfeeds and chat applications.