Calendarscope 

Calendarscope is a full-featured calendar program for planning, managing, and scheduling any events and tasks. Standard calendar views are available. color-coded reminders, Web calendars, Printing, Synchronization with Pocket PC and Palm OS handhelds
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LibMaster.com Simple Task list 

You can at one look see all your tasks and choose the most priority task for execution with consideration of time periods for each task deadline.
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