Beyond Compare - Beyond Compare allows you to compare files and folders.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
Autodesk 3DS Max - 3ds Max is software for 3D modeling, animation, rendering, and visualization. Create stunning game enrivonments, design visualizations, and virtual reality experiences.
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.
ZBrush - ZBrush is a digital sculpting and painting software solution.