DevPlanner is a time planning and to-do list software that allows keeping track of projects, personal tasks, and other activities. Main idea of DevPlanner based on four terms: task, estimation, daily schedule and "self-imposed" deadline. These four things are really important for managing tasks and gathering time feedback, as result improving individual productivity and estimating skills.
http://www.qweas.com/download/business/project_management/devplanner.htm

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