OmniFocus is a personal task manager by The Omni Group, based in GTD method.
OmniFocus is designed to quickly capture your thoughts and allow you to store, manage, and process them into actionable to-do items. Perfect for the Getting Things Done system, but flexible enough for any task management style, OmniFocus helps you work smarter by giving you powerful tools for staying on top of all the things you need to do. OmniFocus for the iPhone brings task management to your fingertips. Keep track of actions by project, place, person, or date. Bring up a shopping list, agenda items to discuss at work, tasks for home, and any other lists you need. Using your location, OmniFocus can create a custom list of actions to complete nearby. Buying groceries? OmniFocus can show you the closest grocery store and create an instant shopping list.