Organizes tasks efficiently with quick add scheduling, 60+ tool integrations, advanced language recognition for recurring tasks, and platform compatibility. It offers project templates, visual task priorities, and personalized productivity insights.

Markor is a TextEditor for Android, versatile, flexible, and lightweight. Markor utilizes simple markup formats like Markdown and todo.txt for note-taking and list management. It is versatile at working with text; it can also be used for keeping bookmarks, copying to clipboard...

Org mode is for keeping notes, maintaining TODO lists, planning projects, and authoring documents with a fast and effective plain-text system.

sleek is an open-source (FOSS) todo manager based on the todo.txt syntax. It's available for Windows, MacOS and Linux.

Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists. It is designed for composite tasks, and also offers effort tracking, categories, notes and more.

Legend (formerly Moo.do) is a notepad, a to-do list, and an outliner, but with advanced features that make the cloud-based application much more useful than any of those tools would be on their own.

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.

neutriNote is an all-in-one preservation of written thoughts, be those text, math (LaTeX), rich markdown, drawings, etc., in fully searchable plain text (universal UTF-8).

Planny is your new friend helping you to be more productive.

Put your most important task or goal in the menu bar. Its presence there will help remind you without being annoying.

Collect your thoughts in a calm interface with simple natural language like “Water the plants every Saturday” then let Actions take care of reminding you automatically.

DayTasks lets you easily manage adding new tasks, removing tasks, marking tasks complete, archiving completed tasks to your done.txt file, and even filtering and searching through tasks in a simple way that lets you find certain projects or contexts easily.