AccuPlan 

Accuplan is a project planner for everyone. Accuplan is a great tool to learn project planning and management with out complexities that come with expensive software.
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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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Smartworks - Project Planner 

Project Planner PE 4.7, lets you track and manage your projects in the way you had always wanted. It offers you several views ( Gantt, Network, Resource, Estimation, Risk, Plan..) to get the broad understanding of where your project is heading.
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Sogol 

Math Assistant and Hypertext Notepad for Engineers and Scientists using Windows. Assists with calculating networks of formulae, dynamic simulations, equation solutions, differential, multiple equations and unknowns, with built-in script language.
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pSogol 

Math Asst., Calculator, and Hypertext Notepad for Scientists and Engineers using Pocket PC 2003. Assists with calculating networks of formulae, dynamic simulations, equation solutions, multiple equations and unknowns, builtin script language.
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MinuteMan 

MinuteMan Project Management Software is an easy to learn and inexpensive way to rapidly manage your projects, featuring Gantt (Timeline) and Pert Charts, Cost Tracking, a flexible Report Generator, and more.
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