I have many Microsoft Project files but use a Mac. I switched to ProjectLibre and simply opened all my project files in ProjectLibre and kept working. The Gantt Chart, Network Diagram, WBS chart along with advanced features like Earned Value costing all work identical to MS Project.
This is AMAZING software and open source!!!!
Microsoft Project - Microsoft Office Project gives you robust project management tools with the right blend of...
iTaskX 3 - Professional and intuitive project management application designed for Mac.
GanttProject - Project scheduling and management tool
OmniPlan - OmniPlan is a platform to visualize, maintain and simplify your projects.
OpenProject - OpenProject is an open-source project management software with a wide set of features and plugins.
Das HQ - Manage your projects from project start to end with Das HQ.