MrProject is an older name for an open-source project management that is now known as Imendio Planner or Gnome Planner.
Versions prior to 0.11 were known as MrProject and development was coordinated by a software company called Code Factory. With version 0.11, the coordinating role was assumed by European software company Imendio and the application was renamed to Imendio Planner. Subsequently, the developers transferred the project to Lanedo GmbH. The project is no longer in active development
MrProject/Planner was once a part of GNOME Office. It was removed in December 2003, apparently because the pace of development was lagging too far behind that of the other components.