What are some alternatives?
When comparing Task Coach and Todo.txt, you can also consider the following products
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Remember The Milk - Remember The Milk is a task and time management application for mobile devices.
Google Tasks - to-do list app that integrates with Gmail and Google Calendar
Taskwarrior - Taskwarrior is an ambitious project bringing sophisticated capabilities to a simple and elegant...
Toodledo - Toodledo provides a set of tools to increase the productivity.
WeDo - WeDo is the best platform for planning and daily tasks management activities.