Provides no-cost C library source code for 2D and 3D geometry operations, boundary offset, area booleans, milling and turning toolpaths.

Offers modelling kernel libraries and related tools for construction, analysis, and presentation of 3D models.

Cadmai ist a parametric and relational CAD module that can be integrated as a intelligent viewer in other applications.

An educational project trying to develop a gesture-based interface for 3D modeling. It uses wxWindows, ACIS, OpenGL and DevIL.

DWGDOMlib and DXFDOMlib modules for reading and manipulating DWG and DXF files from within .NET applications.

A basic experimental lab for geometric shape processing, for learning about the mathematical theory and practical manipulation of various parametric curves.

Supplies geometric constraint managers, hidden line and collision detection components to the CAD/CAM industry.

Graphics libraries for Delphi developers, such as an OpenGL canvas, hidden lines algorithms, and geometry data management.

KernelCAD is an embedded CAD software, which adds interactive 3D solid modeling functionality to any Windows application.

Avax ActiveX control to view, create, edit, print, and manage 2D vector drawings.

Technology provider to CAD/CAM/CAE vendors, offering components for geometry manipulation, information management, and collaborative engineering.

A library for 2-D and 3-D geometric calculation in C, with functions for shape generation, geometric evaluation, intersection, and offsetting and filleting.

Offers libraries for geometric solvers, trimmed surfaces, and polygon optimization, including visualization features.

The VeCAD 2D vector graphics library can be used to create CAD applications.

Offers components for CAD/CAM software, such as the 3D Core CAD-engine, the SmartFit 3D best-fitting application, and related functionality.

Provides a variational geometric solver for CAD, scheduling, planning and other intellectual solutions, using proprietary constraint-based technologies.

A 3D modeling kernel that consists of reusable C++ object libraries that are available as Open Source.

Proprietary terrain visualization graphics engine designed to be embedded in 3rd party systems. Claims that 2000km2 terrains can be interacted with at speeds > 60 fps. Export restrictions may apply.

AutoCAD DXF tools for developers. ABViewer for Windows Commander and Far Manager. 3d DXF viewing and printing with C++, VB, and Delphi.

Develops, markets and supports software components for 3D modeling, visualization, and interoperability, such as the ACIS solid modelling kernel.

Object oriented 2D/3D graphics libraries with AutoCAD file format support, as well as a web-based version.

ActiveX control to view and edit 2D vector graphic. CAD Control utilizes the common AutoCAD DXF format. It is optimized for size and performance and could be used to display graphic on web.

CadLib is A .NET DXF file manipulation library with 2D and 3D support that also handles export to image formats and PDF.