Effitask

Effitask is a graphical task manager, based on the todo.txt format.

19 Alternatives To Effitask

California

California is a new calendar application for GNOME 3. It’s currently under heavy development.

DayTasks

Minimal todo.txt-compatible app for Ubuntu.
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Markor

Text editor - Notes, ToDo & Bookmarks. Markdown and todo.txt support.

Memory by Timely

An intelligent timeline of everything you did in a day.

Nozbe

Nozbe - to-do, task, project and time management productivity gtd getting things done online application with software for Apple iPhone iPad Android Mac Windows Linux

Org mode

Org: an Emacs Mode for Notes, Planning, and Authoring

Remember The Milk

Remember The Milk is a task and time management application for mobile devices.

Simple Calendar

A simple calendar with events (optional recurring and reminders), week numbers and a customizable…
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Simplenote

The simplest way to keep notes. Light, clean, and free. Simplenote is now available for iOS, Android, Mac, and the web.

Task Coach

Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.
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Taskwarrior

Taskwarrior is an ambitious project bringing sophisticated capabilities to a simple and elegant…

ToDoList

Windows desktop application to stay on top of your daily tasks.

Todo

Todo is a to-do and task list app.
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Todoist

Todoist is a to-do list that helps you get organized, at work and in life.

Tomboy

Apps/Tomboy - GNOME Wiki!
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Trello

Infinitely flexible. Incredibly easy to use. Great mobile apps. It’s free. Trello keeps track of everything, from the big picture to the minute details.

VueMinder Calendar

Take control of your schedule and get reminded wherever and however you want.
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Zenkit

Zenkit is the home you always wanted for your ideas, your projects, your business.