Mac users interested in Xplan 3.1 generally download:
xPlan allows you to manage everything related to your projects, including tasks, resources, contacts, hours, etc. It has an easy-to-use interface, in which tabs allow you to browse through the different parts of a project. Since it still may be somewhat complicated, it is good there is excellent online help documentation to answer any possible questions.
Additional suggestions for Xplan 3.1 by our robot:
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This application converts MS Flight Simulator 2004 and FSX add-on scenery.
This application edits X-Plane DSF overlay scenery packages for X-Plane.