Free MS Project Viewer, Projectsimple a Free windowsbased Project Tool and also MS Project viewer with Burndown chart and export to excel: If you dont have a othe project tools you can make your own project plan with a nice and professional Gantt. as shown below.
You can also create your own projects, tasks, ressources in a simple version of project planning application in a prj file format. ProjectSimple has the most common function which a project manager needs to create a project.

ProjectSimple Features:
1. Free ProjectViewer.
2. Ms Project 2003/2007 Viewer.
3. ProjectTool
4. Tasks Definitions.
5. Resource definition
6. Allocation
7. Assignments
8. Calculation of Work, Actualwork, Remaining Work, Work Done in %.
9. Ganttdiagram.
10. User friendly.
11. Burndown chart
12. Assignement list

Requirements:
* .NET Framework 3.0

The license of this software is Freeware, you can free download and free use this flowchart & diagram software.