Gmsh - Gmsh is a 3D finite element grid generator with a build-in CAD engine and post-processor.
TetGen - A Quality Tetrahedral Mesh Generator and a 3D Delaunay Triangulator
Altair - Visually Analyze Any Data at the Speed of Business
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
ANSYS Fluent - ANSYS engineering simulation and 3D design software delivers product modeling solutions with unmatched scalability and a comprehensive multiphysics foundation.
ANSA - Product description of ANSA pre-processor of BETA CAE Systems.