sleek is an open-source (FOSS) todo manager based on the todo.txt syntax. Stripped down to only the most necessary features, and with a clean and simple interface, sleek aims to help you focus on getting things done.
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.Discontinued
Android and iPhone official apps are no longer maintained. Todo.txt CLI seems still developed: latest version, 2.12.0, released in August 2020, can be still downloaded from GitHub
With NotePlan you get serious work done. It helps you to capture important details and keep track of things at work. Manage your calendar, todos and notes in one place. Find out how!
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.This app doesn't have any features at the moment.