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NeoForm
If you are a designer who wants to create products using sweeping curves and sculptured surfaces, Neoform provides intuitive, creative freedom combined with curvature evaluation capabilities.
http://www.graphicmagic.com/Neoform/NFDownloadableDemos/NFDownloadableDemos.html

Rhino
Start with a sketch, drawing, physical model, or only an idea-Rhino provides the tools to accurately model your designs ready for rendering, animation, drafting, engineering, analysis, and manufacturing. This fully functional version will save 25 times. After that it is still functional except it will not save. The evaluation version also supports plug-ins.
http://download.mcneel.com/rhino/3.0/eval/

VectorEngineer
VectorEngineer Quick-tools is a free version of the VectorEngineer Pro-tools program and gives you a personal CAD system with extensive capabilities to produce professional technical drawungs and designs.
http://www.vectorengineer.com/vectorengineer_site_005.htm

IntelliCAD
IntelliCAD® 4 is the intelligent choice for architects, engineers, designers - virtually any professional who creates or uses CAD drawings.
http://www.autodsys.com/subscribeintellicad.php

Quality CAD Software for Woodworkers
RouterCAD offers computer aided drafting software for woodworking industry. Our RouterCAD Inventor 2005 can break apart a 3D model and export them as individual parts.
http://www.routercad.com

PTC Pro/ENGINEER
Pro/ENGINEER Complete NC Machining provides manufacturing engineers and job shops with complete NC programming capabilities and tool libraries that allow users to create all types of programs for CNC machines. It enables them to work concurrently with designers to automatically incorporate design changes, dramatically increasing product quality, reducing scrap, and cutting production time and costs. Provides NC programming capabilities to create, verify, and optimize programs for all machine types: 2 1/2- to 5-axis milling (including continuous multi-axis), 2- to 4-axis turning, mill/turn machines (live tooling) and 2- to 4-axis wire EDM.
http://bbweek.bitpipe.com/detail/PROD/1017065059_486.html

CAD/CAM
Acronym for computer-aided design/computer-aided manufacturing, computer systems used to design and manufacture products. The term CAD/CAM implies that an engineer can use the system both for designing a product and for controlling manufacturing processes. For example, once a design has been produced with the CAD component, the design itself can control the machines that construct the part.
http://winplanet.webopedia.com/TERM/C/CAD_CAM.html

Calc 3D
The calculator can do statistics, best fits, function plotting, integration. It handles vectors, matrices, complex numbers, quaternions, coordinates, regular polygons and intersections. For point, line, plane, sphere, circle Calc 3D calculates distances, intersections, and some additional information like volume and area. Cartesian, spherical and cylindrical coordinates can be transformed into each other. Carthesian plot, polar plot, parametric plot, best fit, fast fourier transformation, histogram, smooth,... Several languages can be handeled.
http://www.greuer.de/ecalc3d.html

AccuRender
AccuRender creates stunning, life-like images from your 3-D models inside AutoCAD 2000, 2000i, 2002, 2004, and 2005, Architectural Desktop, and Mechanical Desktop, Revit, or Rhino.AccuRender is the only renderer that uses raytracing and radiosity technologies to create high quality, photorealistic, still, panorama, and animation image files.
http://www.accurender.com/

2d CAD Image 5
CAD Image DLL Revolution in custom CAD development! Incredible speed and accuracy of DXF, DWG, HPGL, SVG, CGM files visualization. Ideal for inner industry programming with MS Visual Basic, MS Visual C++, Borland Delphi,C++Builder
http://www.itlocation.com/en/software/prd37844,,.htm