Paraview - ParaView is an open-source, multi-platform application designed to visualize data sets of size...
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.
Altair - Visually Analyze Any Data at the Speed of Business
NETGEN - NETGEN is an automatic 3d tetrahedral mesh generator.
Tecplot 360 - Tecplot 360 is a software package used in post-processing numerical simulation results.