Ageometric modeling kernel is asolid modeling software component used incomputer-aided design (CAD) packages.^[1][2] Available modelling kernels include:

• ACIS is developed and licensed bySpatial Corporation ofDassault Systèmes.
• SMLib is developed bySolid Modeling Solutions.^[3]
• Convergence Geometric Modeler^[4] is developed byDassault Systèmes.
• Parasolid is developed and licensed bySiemens.
• Romulus was a predecessor to Parasolid.
• ShapeManager^[5] is developed byAutodesk and was forked fromACIS in 2001.
• Granite^[6] is developed byParametric Technology Corporation.
• C3D Modeler is developed by C3D Labs, part of theASCON Group.^[7][8]
• CGAL is anopensource Computational Geometry Algorithms Library which has support for Boolean operations on Polyhedra; but no sweep, revolve or NURBS.
• Open CASCADE is anopensource modeling kernel.
• sgCore is a freeware proprietary modeling kernel distributed as an SDK.^[9]
• K3 kernel^[10] is developed byCenter GeoS.
• SOLIDS++^[11] is developed by IntegrityWare, Inc.
• APM Engine^[12][13][14] is developed byRSDC APM.
• KCM^[15] is developed and licensed by Kubotek Kosmos^[16]
• SvLis Geometric Kernel became opensource and discontinued, for Windows only.
• IRIT modeling environment, for Windows only.^[17]
• GTS^[18] GNU Triangulated Surface Library, for polygon meshes only and not surfaces.
• Russian Geometric Kernel.
• Geometry Kernel,^[19] a multi-platform C++ library with source code accessible for clients, developed and distributed by RDF -Geometry Kernel web site.
• SolveSpace has its own integrated parametric solid geometry kernel with a limited NURBS support.

The kernel market currently is dominated byParasolid andACIS, which were introduced in the late 1980s. The latest kernel to enter the market isKCM.ShapeManager has no presence in the kernel licensing market and in 2001Autodesk clearly stated they were not going into this business.^{[citation needed]}

The world's newest geometric modeling kernel isRussian Geometric Kernel owned by the Russian government, and it is not clear if it is going to be commercially available, despite offering unique features over the other kernels on the market.^{[20][21][22][23]}

The table below contains a representative list of developers developing their own kernel or licensing the kernel from a third-party.^[24]

• 3D graphics software
• Computer-aided design

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