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.
Pocket Informant - Pocket Informant is the Best Calendar app for mac and iOS. Pocket Informant for iOS, Mac desktop, and Android.
Things - Things is an easy to use task manager.