Doit.im!

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

Wekan, formerly LibreBoard, is an open-source and collaborative Trello -like kanban board application.

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.

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

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

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.

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

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

WizNote is a Note software, which is especially designed for Internet users and mobile Internet users. WizNote focuses more on notes of rapid collection, management, reading and sharing. WizNote is smaller, more stable, and more suitable for computers, phones and mobile devices. It has a more abundant notes organization and rapid fulltext retrieval. Using associated online service, you can synchronise the notes between your computer and your cell phone.