http://www.simplegtd.com/
What is Simple GTD?
Simple GTD is a completely free web-based tool which help you in organizing your stuff and will assist you to applying "GTD Principles" in your daily life.
I've been doing some "research" on GTD. It's a theory of organization to "Get Things Done" based on a book by David Allen. More information can be found on his web site http://www.davidco.com/.

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