What are some alternatives?
When comparing jdotxt and Nozbe, you can also consider the following products
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Amazing Marvin - Customizable task manager and day planner
Wrike - Wrike is a flexible, scalable, and easy-to-use collaborative work management software that helps high-performance teams organize and accomplish their work. Try it now.
Effitask - Effitask is a graphical task manager, based on the todo.txt format.