Based on our record, TetGen seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
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: almost 3 years ago
FreeCAD - An open-source parametric 3D modeler
Gmsh - Gmsh is a 3D finite element grid generator with a build-in CAD engine and post-processor.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
NETGEN - NETGEN is an automatic 3d tetrahedral mesh generator.
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