What are some alternatives?
When comparing jdotxt and mpcjanssen.nl Simpletask Cloudless, you can also consider the following products
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Habitica - Habitica is a free habit building and productivity application.
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
Remember The Milk - Remember The Milk is a task and time management application for mobile devices.
Amazing Marvin - Customizable task manager and day planner
Nozbe - Nozbe - to-do, task, project and time management productivity gtd getting things done online application with software for Apple iPhone iPad Android Mac Windows Linux