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OpenProj by Projity is a desktop replacement of Microsoft Project. OpenProj has equivalent functionality, a familiar user interface and even opens existing MSProject files. OpenProj is interoperable with Project, with a Gantt Chart and PERT chart etc.
You can download a free viewer from the Microsoft site
The open source alternative to M$ project is OpenProj. Not sure if it can read the files though.
EDIT:
http://sourceforge.net/projects/openproj/