Task Coach
Todoist
Remember The Milk
EssentialPIM
Todo.txt
Things
TickTick
Google Tasks
Whenever
Future
Loxi
Event Calendar App
Calendar by 44
Dials
Wunderlist Calendar for Outlook
Deadlines
Task Coach
WheneverTodoist - Todoist is a to-do list that helps you get organized, at work and in life.
Future - Calendar events around the clock
Remember The Milk - Remember The Milk is a task and time management application for mobile devices.
Loxi - Easily add an events calendar to any website.
EssentialPIM - EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries and email messages across multiple devices and cloud applications.
Event Calendar App - A simple, easy to manage, way of displaying events