iGTD: Getting Things Done for MAC is a very useful MAC tool to get organised.
Cost / License
- Freemium
- Proprietary
Platforms
- Mac

Apps similar to One Thing include Super Productivity, which is free and open source. Other options are Todoist, TickTick, Workflowy and Tasks.org. Todo List Managers like One Thing are a crowded field, with more than 100 alternatives for the web, Mac, Android, iPhone and Windows.
iGTD: Getting Things Done for MAC is a very useful MAC tool to get organised.

A free, simple todo list program for Windows. Fast as Notepad, supports subtasks, custom task orders and more. Works as a basic mind mapper as well.

Online GTD manager.
You can use it to manage your goals, projects and tasks, set next actions and contexts, use checklists, schedules and a calendar. A mobile version is available too.




TODOWIZ is an app which will lend you a hand to accomplish the task that needs to be done on first priority. It lets you lighten up by keeping the important tasks on your finger tip that you can forget at any instant and helps you in fulfilling your task within deadlines.




Collaborate on projects, track time, manage expenses and invoice your customers. Available in the cloud, from any device!.




GTD-Free is personal TODO/action manager inspired by GTD (Getting Things Done) method by David Allen (see David Allen&Co. official site for more information). GTD-Free tries to be simple and easy to use management tool. GTD-Free is free open-source software.



The epic task management app that will keep you motivated with trophies, leveling up and comparing your workflow with others.



Task Office - existing GTD, to do lists, projects and contacts management apps. Designed to make business planning, scheduling and getting things done more efficient. Task Office makes your plans clear and achievable.




Actiontext is a very simple and basic universal app for managing your tasks. It uses the todo.txt file format. You can then synchronise the file with your cloud provider of choice.


This app would replace default calendar event notifications, providing snooze functionality and notifications persistence. Reboot is handled, all notifications are restored after reboot.



Manage team or personal tasks within your organization. Whether routine work or one-time tasks, always know who does what and when.



