This is the only task manager that gets you "unstuck". This is a full GTD system with tasks, projects, contexts, and areas of responsibility but also with step by step problem-solving when you find that a task isnt getting done. Also has a "Pomodoro" style timer that encourages you to tackle your task for 25 minutes, and even logs that time on your calendar so you can look back and see when you were productive. This is excellent.