If you want to have a simple yet effective todo manager, this application is for you. It is an open source application for managing your personal tasks and todo list. One of useful features are having composite tasks which you can set this by contexts or projects. It should able to convert for using GTD method. Here is its introduction:
Task Coach is a simple open source todo manager to manage personal tasks and todo lists. It grew out of my frustration that well-known task managers, such as those provided with Outlook or Lotus Notes, do not provide facilities for composite tasks. Often, tasks and other things todo consist of several activities. Task Coach is designed to deal with composite tasks.
I would NOT recommend this tool. I loved the interface, great interaction, and great idea with tracking effort. However, it’s not reliable. I first started by moving over old tasks and gradually started adding new tasks only in here this week.
Today, after closing it down and then reopening it, it would no longer load my TSK file, despite having created it. It offers the very unhelpful message: “Error loading file. Are you sure this is a TaskCoach file? ” Yes, I’m quite sure it is, because I never touched it, and the program created it. There doesn’t appear to be any explanation of where in the file it died, although my guess is that some of my descriptions may either be too long (though it never complained when I put them in) or have odd characters from copying in mail or chat logs (again, it never complained when I put them in).
Let me tell you, suddenly losing a week’s worth of stuff *really* sucks.
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I have been using TaskCoach more than a year and I should say that now it’s very estable.
I’m using it since several month now. Had occasional crashes but never lost a lot of work thanks to continuous backups. Far more reliable than 3 years ago. It can now be used for production work. It even replaced OmniFocus for my needs. I lost a bit of ergonomy but gained a lot of features and multiple categories/contexts.
I really am loving Task Coach. It is so powerful and flexible. Some things worked differently than my initial intuition, but they worked in the end. Other things inspired me to achieve things I wouldn’t have even thought of on my own. Note that the review below about reliability is extremely old. The latest version is not without bugs, but it is very reliable and constantly backs up so you will not lose any data. It only gets better from here. In my view, this is an example of Free/Open-Source software being superior to all the proprietary options even for features (though not for aesthetic admittedly).