"Spatial, ACIS, CGM, and the future of geometric modelers". In the table below you can see a representative list of developers that belong to companies developing their own kernel or licensing the kernel from third-party. The world's newest geometric modeling kernel is Russian 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. ShapeManager has no presence in the kernel licensing market and in 2001 Autodesk clearly stated they were not going into this business. The latest kernel to enter the market is KCM. The kernel market currently is dominated by Parasolid and ACIS, which were introduced in the late 1980s. SolveSpace application has own integrated parametric solid geometry kernel with a limited NURBS support.Geometry Kernel, a multi-platform C++ library with source code accessible for clients, developed and distributed by RDF - Geometry Kernel web site.GTS GNU Triangulated Surface Library, for polygon meshes only and not surfaces.
IRIT modeling environment, for Windows only. SvLis Geometric Kernel became opensource and discontinued, for Windows only. KCM (Kosmos Core Modeler) is developed by Kubotek3D subsidiary of Kubotek Corporation, released in 20. SOLIDS++ is developed by IntegrityWare, Inc. K3 kernel is developed by Center GeoS. sgCore is a freeware proprietary modeling kernel distributed as an SDK. Open CASCADE is an opensource modeling kernel. CGAL is an opensource Computational Geometry Algorithms Library which has support for boolean operations on Polyhedra but no sweep, revolve or NURBS. C3D Modeler is developed by C3D Labs, part of the ASCON Group. Granite is developed by Parametric Technology Corporation. ShapeManager is developed by Autodesk and was forked from ACIS in 2001. 
Romulus was a predecessor to Parasolid. 
Parasolid is developed and licensed by Siemens. Convergence Geometric Modeler is developed by Dassault Systèmes. SMLib is developed by Solid Modeling Solutions. ACIS is developed and licensed by Spatial Corporation of Dassault Systèmes. A geometric modeling kernel is a solid modeling software component used in computer-aided design (CAD) packages.
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