GanttPV creates project schedules. It is scriptable, cross platform, open source.

Schedule multiple projects. Capture task durations, dependencies, and start dates. Calculate end dates, free float, total float, and gantt charts (by day, week, month, or quarter). Export to HTML.

Allocate hours based on task duration and effort estimates. Calculate resource workload by day and week. Manage followup. Track team productivity and expenses.

This project management software for Microsoft Excel is designed for those who need a quick and easy project planning software solution for a reasonable price. The primary feature of this product is a well-designed, easy-to-use Gantt chart used to measure and present your project's progress.