Develops, markets and supports software components for 3D modeling, visualization, and interoperability, such as the ACIS solid modelling kernel. http://www.spatial.com/
Technology provider to CAD/CAM/CAE vendors, offering components for geometry manipulation, information management, and collaborative engineering. http://www.geometricsoftware.com/
AutoCAD DXF tools for developers. ABViewer for Windows Commander and Far Manager. 3d DXF viewing and printing with C++, VB, and Delphi. http://www.cadsofttools.com/
Provides no-cost C library source code for 2D and 3D geometry operations, boundary offset, area booleans, milling and turning toolpaths. http://www.buildingblock.com/
Provides a variational geometric solver for CAD, scheduling, planning and other intellectual solutions, using proprietary constraint-based technologies. http://ledas.com/