Soft Gold, Ltd. - AutoCAD DXF tools for developers. ABViewer for Windows Commander and Far Manager. 3d DXF viewing and printing with C++, VB, and Delphi. Cadmai Software GmbH - Cadmai ist a parametric and relational CAD module that can be integrated as a intelligent viewer in other applications. Geometry Handling Library - A library for 2-D and 3-D geometric calculation in C, with functions for shape generation, geometric evaluation, intersection, and offsetting and filleting. CurveTrainer - A basic experimental lab for geometric shape processing, for learning about the mathematical theory and practical manipulation of various parametric curves. VectorDraw Drawing Components - Object oriented 2D/3D graphics libraries with AutoCAD file format support, as well as a web-based version. DeveloCAD.com - Graphics libraries for Delphi developers, such as an OpenGL canvas, hidden lines algorithms, and geometry data management. Open CASCADE - A 3D modeling kernel that consists of reusable C++ object libraries that are available as Open Source. C4W - Offers modelling kernel libraries and related tools for construction, analysis, and presentation of 3D models. Spatial Corporation - Develops, markets and supports software components for 3D modeling, visualization, and interoperability, such as the 3D ACIS Modeler solid modelling kernel. Weresc - Offers CADE, a CAD ActiveX control to view and edit 2D vector graphic, with web and DXF support. IntegrityWare, Inc. - Offers libraries for geometric solvers, trimmed surfaces, and polygon optimization, including visualization features. Kotem Technologies Inc. - Offers components for CAD/CAM software, such as the 3D Core CAD-engine, the SmartFit 3D best-fitting application, and related functionality. LEDAS Ltd. - Provides a variational geometric solver for CAD, scheduling, planning and other intellectual solutions, using proprietary constraint-based technologies. DInsight - KernelCAD is an embedded CAD software, which adds interactive 3D solid modeling functionality to any Windows application. Wout Ware - CadLib is A .NET DXF file manipulation library with 2D and 3D support that also handles export to image formats and PDF. Building Block Software - Provides no-cost C library source code for 2D and 3D geometry operations, boundary offset, area booleans, milling and turning toolpaths.