TaskPrompt 

Complete all your daily and scheduled tasks on time. TaskPrompt is a task reminder utility. You can add tasks and categorize them. Set the task's occurrence to Immediate, Todo, Minutes, Hourly, Hours, Daily, Days, Weekly, Weeks, Monthly, etc.
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Avalio Task Scheduler 

Avalio Task Scheduler gives you ability to manage required tasks according to schedule. The component can be used to create reports, update site content, call ASP pages at particular time, check if web-server is functioning or IIS requires restart.
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Anasoft Scheduler PE 

Strong and visual personal scheduling tool, it supports: * various user or system task types; * various reminding sound; * many scheduling types; * optional waiting time; * optional password protection; * statistics, event log.
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GanttPV - Project Scheduling Software 

GanttPV: Create project schedules. Set task durations and dependencies. Calculate end dates, float, gantt charts, and resource workload. Export to HTML. Manage followup. Track productivity and expenses. Scriptable, cross platform, open source.
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Get It Done 

Get It Done is a powerful and easy to use to-do list program that allows you to organize and prioritize everything that you have to get done. It has many useful features including the ability to prioritize, categorize, and print your task list.
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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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