Plan is a project planner which is similar to, and compatible with, Microsoft Project. Plan for Windows is supported on Windows 7/Vista/XP/NT/2000 based desktop PCs.
Plan for Windows can be used in various ways:
As a viewer for Microsoft Project files - it can directly read and write Microsoft Project files (MPP/MPD/MPX can be read, MPD/MPX can be written)*.
As an inexpensive alternative to Microsoft Project. Plan doesn't have all the bells and whistles of Microsoft Project, but this makes it much easier to use. This makes it a highly cost effective alternative to Microsoft Project.