24me - Next Generation Personal Assistant
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Awesome Cal - Awesome Cal is a Calendar application for your iPhone that you can take anywhere and keep close by to monitor all the upcoming birthdays, festivities, meetings, and more from a single place.
Remember The Milk - Remember The Milk is a task and time management application for mobile devices.
Calvetica - The fast calendar for iPhone. Add an event in just two quick taps.
Things - Things is an easy to use task manager.