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.
Joi Planner is an all-in-one app that brings together your calendar, to-do list, and habit tracker into a single timeline and gives you a clear overview of your day.
Todour is an application for handling todo.txt files (as made famous by Gina Trapani of Lifehacker) on Windows, Mac and Linux. The format is especially practical for an approach similar to the one suggested in the book Getting Things Done by David Allen, often referred to as...
Sweden
EU
Online Gantt project management with interactive drag-and-drop scheduling, real-time team collaboration, multi-view display, cost-loaded tracking, resource balancing, customization, risk management tools, templates, centralized tasks, and live timeline sharing.
United States
United Kingdom
A simple task list manager that strives to have just enough features to do GTD, but no more. Based on the Todo.txt app so a todo.txt file.
NetherlandsEU
2Do lets you take a completely different approach to managing your tasks. With its extremely simple-to-use interface and a comprehensive and flexible set of powerful features, it lets you focus on what's most important to you: your life.
United Kingdom
Online task management app built by GTD enthusiasts for GTD enthusiasts.
Outline style interface supports unlimited levels of sub-projects and tasks. 100% GTD compliant.
GTD style lists, like waiting, scheduled, someday/maybe, next and focus.
Advanced features allow for sequ.
United States
Once enabled, a new Tasks menu will appear in your Nextcloud apps menu. From there you can add and delete tasks, edit their title, description, start and due dates, reminder times, mark them as important, and add comments on them. Tasks can be shared between users.
GermanyEU
Make lists and get organized. TaskPaper is a plain text to-do list that’s surprisingly adept.
United States
An open-source Android planner for students that combines a to-do list and calendar for schoolwork and events. It offers due-date and event reminders, task attachments, persistent notifications, an ad- and tracking-free experience, simple organization, and an on-device database.
Philippines
GNOME To Do is a simplistic personal task manager designed to perfectly fit the GNOME desktop. Designed from ground up to seamlessly integrate with the GNOME desktop environment, To Do enables you to be as productive as you want.
United States
Feature rich kanban board collaboration platform. Fun UI, super fast, allows you to comment on to do list items, awesome activity feed and inbox tools to keep an eye on things. Mobile friendly iOS + Android.
