MyLifeOrganized Alternatives for Mac OS X

Todoist: To-Do list and Task Manager.

Things is a delightful and easy to use task manager.

A simple and friendly task manager written in Python.

OmniFocus is a personal task manager.

Doit.im is a Cross-platform Best Online GTD Service, which can sync with Phones.

fluxday is a user-friendly, free & opensource task & productivity management tool for growing startups.

Org-mode is an Emacs Mode for Notes, Planning, and Authoring.

todo.txt is software and operating system agnostic; it's searchable, portable, lightweight and easily Todo management software.

2Do lets you take a completely different approach to managing your tasks. With its extremely simple-to-use interface.

Taskwarrior is an open-source, cross platform time and task management tool. It has a command-line interface rather than a graphical user interface.

OmniOutliner is a commercial outlining software for Mac OS X.

GTDNext is a task management app available online and works in Chrome, IE and Firefox.

Nitro is free open source task management software.

Tasque is an open source task management application.

Conqu is a simple yet powerful task management tool designed to help you conquer your inbox and get things done.

Nozbe is a to-do, task, project and time management application.