TetGen
Gmsh
NETGEN
Altair
Pointwise
Blender
Unity
ANSA
VisIt
Paraview
Blender
Gmsh
Tecplot 360
Mayavi
GiD
GGobi
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Personally I just tetrahedralize the mesh offline (using tetgen, GPL is meaningless when it's offline) and then use a volume based query similar to that described in Rendering wounds in L4D2 based on the tet centroids. Find a planar projection for the surviving interior tet faces and use that for coordinates. Everything gets partitioned into shared vertex/index buffers for reference and the final buffers are mixed... Source: over 2 years ago
Gmsh - Gmsh is a 3D finite element grid generator with a build-in CAD engine and post-processor.
Paraview - ParaView is an open-source, multi-platform application designed to visualize data sets of size...
NETGEN - NETGEN is an automatic 3d tetrahedral mesh generator.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Altair - Visually Analyze Any Data at the Speed of Business
Pointwise - Pointwise is the choice for CFD Meshing. It's easy to use, highly automated, provides direct interfaces to popular CFD analysis software, and comes with professional tech support.