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Todoist is a task manager thats useful, fast and easy to use.

Asana is a web and mobile collaborative work management app that goes beyond typical collaboration software by enabling teams to track everything they're working on. With tasks, projects, conversations, and dashboards, Asana lets your team know who's doing what by when to help you get results. Use Asana for team communication, setting meeting agendas, running brainstorms, sharing files, or creating shared calendars--anything you can think of. You can also add partner integrations to customize Asana for your team with functionality like Gantt charts, time-tracking, and Google calendar sync. Asana is available on web, iOS, and Android and is free for teams of up to 15 people. »

Take your tasks anywhere with this feature-packed application.

A simple but effective way to keep on top of your tasks, 10 languages.

An easy to use, web-based to-do list. Get organized, stay motivated, and be more productive.

Task Coach is a well-structured, portable, open source todo / task manager (supporting 50 languages). It grew out of frustration that well-known task managers, such as those provided with Outlook or Lotus Notes, do not provide facilities for composite tasks. Over time, Task Coach has added effort tracking, budgeting, notes, priority adjusting, reminders, and many other features.

Any.DO helps you get things done with your friends in a simple & elegant way. It's free, simple & fun.

Producteev is an online task management tool that serves as your full Productivity platform (Task and Project Management, Files Sharing, Internal Communication and Productivity Apps Aggregation).

Org-mode is for keeping notes, maintaining ToDo lists, doing project planning, and authoring with a fast and effective plain-text system.

Track your tasks and projects in a plain text file, todo.txt. A todo.txt is software and operating system agnostic; it's searchable, portable, lightweight and easily manipulated.

EssentialPIM lets you manage appointments, tasks, notes, contacts, password entries and email messages across multiple devices and cloud applications.

Opensource task & productivity management tool for startups, engineered based on the concepts of OKR.

Checkvist is a web tool for creating online outlines, hierarchical task lists, collecting and structuring all kinds of information. It has an outstanding keyboard support so you can easily re-structure your lists, filter, hoist and beef them up with tags, due dates, links, or attachments. Collaboration, Markdown, code highlighting, import and export (OPML, text) make Checkvist an ideal hub for working on complex IT projects.