1)   Smartworks - Project Planner Reader 2.0
Project Planner Reader - Free reader / Viewer to read files created by Smartworks Project planner version 4.X and MS Project .MPP files.. Frees you from having a project management software to share project plans among users.

 2)   Project Planner PE lite 4.7
Project Planner- PE lite :An Affordable alternative to MS-Project. It has most features found in the Project planner - PE version. However it lacks the feature to save your files .PPR format which can be read by others.

 3)   project2planner 2.0
Free tool to convert project plans created by MS-Project (MPP files) to Smartworks Project planner (PPR) format. Users can now share the MPP files with others who do not have MS-Project installed on their system.