2Do!

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

Habitica is a free habit building and productivity app that treats your real life like a game. With in-game rewards and punishments to motivate you and a strong social network to inspire you, Habitica can help you achieve your goals to become healthy, hard-working, and happy.Treat your life like a game to stay motivated and organized! Habitica makes it simple to have fun while accomplishing goals.Input your Habits, your Daily goals, and your To-Do list, and then create a custom avatar. Check off tasks to level up your avatar and unlock features such as armor, pets, skills, and even quests! Fight monsters with friends to keep each other accountable, and use your gold on in-game rewards, like equipment, or custom awards, like watching an episode of your favorite TV show. Flexible, social, and fun, Habitica is the perfect way to motivate yourself to accomplish anything. »

Take your tasks anywhere with this feature-packed application.

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.

TickTick is your daily must-have to-do & task list to make all things done and get life well organized.

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).

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.

OmniFocus is a personal task manager by The Omni Group, based in GTD method.

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

Quire is a new-generation collaborative task management tool for organizing tasks in a tree-like structure wrapped in simple and user-friendly UI.