Gmsh - Gmsh is a 3D finite element grid generator with a build-in CAD engine and post-processor.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Paraview - ParaView is an open-source, multi-platform application designed to visualize data sets of size...
ZBrush - ZBrush is a digital sculpting and painting software solution.
Sculptris - Sculptris: Enter a world of digital art without barriers.
VisIt - VisIt is an Open Source, interactive, scalable, visualization, animation and analysis tool.