TaskPaper is described as 'Make lists and get organized. TaskPaper is a plain text to-do list that’s surprisingly adept' and is a todo list manager in the office & productivity category. There are more than 100 alternatives to TaskPaper for a variety of platforms, including iPhone, Mac, Web-based, iPad and Android apps. The best TaskPaper alternative is Todoist, which is free. Other great apps like TaskPaper are Workflowy, Wekan, Org mode and ToDoList.
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.
OmniFocus is designed to quickly capture your thoughts and ideas to store, manage, and help you process them into actionable to-do items.
Any.do is an award-winning app used by millions of individuals, families and teams to stay organized and get more done.
Nirvana is a secure, cloud-based GTD® task manager accessible from your desktop web browser and mobile devices. If you have more to do than you can manage in your head, or if you want greater clarity of mind and focus in life, Nirvana is for you.
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.
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.
FoldingText makes you productive in easily formatted plain text. Turn your ideas into plans. Your to-dos into results. Your writing into clear, focused documents.
Simple GTD application to manage your tasks and to-dos. Syncs with web server. Complete with the usual Inbox, Today, Next, Tomorrow, Scheduled and Someday "buckets" as most GTD programs have. You can also create Projects for tasks with multiple steps.
Sqrte Tasks is a different take on ToDo lists. It strives to maintain the simplicity of paper lists while adding the efficiency benefits you'd expect from a software solution. It's also privacy-minded and the free version is open source.
SwiftoDo is a task list built specifically for the todo.txt file format, and allows you work with your existing todo.txt.
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A full-featured GTD-style app, very well executed. The other end of the "spectrum" from TaskPaper's minimalist approach.