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3ds Max
From Unreal Wiki, The Unreal Engine Documentation Site
Autodesk 3DS Max, formerly Autodesk 3D Studio Max, is a product by Autodesk Inc. It is used for 3D modeling, animation, rendering, post-production and more. Game developers are the ones who mostly use this commercial software. You can download a free 30 day trial or buy a full version at the Autodesk website: http://www.autodesk.com