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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. »

Workflowy lets you organise your brain into easily manageable lists. It also works as a single-pane outliner with inline notes. It offers one-click hoisting (zooming into branches). The online version syncs with mobile apps.

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

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.

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

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

MyLifeOrganized (MLO) is a personal task outliner and to-do list manager which will help you to organize your goals, projects and tasks into a tree.

Make lists and get organized. TaskPaper is a plain text to-do list that’s surprisingly adept.

Moo.do is designed to be the best and easiest way to keep your life and thoughts organized: projects, to-do lists, appointments, contacts, reminders, events, and anything else you want to write down. As all modern apps should be, Moo.do is available on any computer, tablet, or phone and synchronizes all devices and users in realtime.

germ.io is a project management tool that is centered around ideas and taking them through to execution.

Gettick is a simple environment that provides managers with a complete overview of the project, while giving the team everything they need to work on the project. Thanks to the Gettick you will not need anything else so you will save a lot of time an money for other limited tools.

Smartest way to work on your computer. Freeter is a productivity app that allows you to gather everything you need to work in one place and access them quickly and easily.

GeeTeeDee is a fancy, lightweight, easy to use and effective task management software. Available for Windows, Linux and soon for Mac and Mobile.