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.
Paraview - ParaView is an open-source, multi-platform application designed to visualize data sets of size...
Unity - The multiplatform game creation tools for everyone.