ThreeDimSim:3D Mechanics simulator 

ThreeDimSim is a powerful 3D mechanics simulation and rendering application. A 3D scene is defined by script using simple shapes and imported meshes from CAD files. Mechanics are simulated and rendered and can be analysed and exported.
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VeCAD DLL/OCX 

VeCAD is a 3D vector graphics library. It serves as a foundation for your own customized drawing applications (CAD/GIS). The library is furnished in two discreet formats; as a run-time Windows 32 bit DLL; and, as an OCX. Both are included.
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TCAD for Borland Delphi&C++ Builder 

TCAD is a component that will help you write vector graphics applications. Shapes can be interacted with by mouse or code. It is easy to use, effective and powerful. It will save you valuable time.
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Sheet Lightning Demo 

Sheet Lightning is a specialised engineering 2D/3D CAD System for creating and unfolding sheet metal designs for fabrication or manufacture. It handles cylinders, cones, square-to-round adapters, ovals, intersections and mutli-intersections.
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AcadExcel CAD Table Tool 

AcadExcel is an AutoCAD "add in", designed for handle table in AutoCAD. Using our AcadExcel, you can use MicroSoft Excel as a table editor. You can create, edit, modify or import table for AutoCAD drawing quickly and simply.
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eMachineShop 

Totally free professional Computer Aided Design (CAD) software allows users to design in 2D and 3D. Easy uncluttered interface yet powerful. This free CAD software not only lets you draw objects but you can actually have your parts made!
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