ADOS 

ADOS is full-featured program that can help you design, analyze and optimize superior optical systems. ADOS provide an integrated software environment that enables you complete almost any task in contemporary optical design.
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AbleVector 

ABLE VECTOR is a shareware to vectorise raster (digital) images to vectorgraph (such as Adobe Illustrator, Macromedia Freehand, or CorelDraw, AutoCAD, TigerCAD, IronCAD etc.) in line style and save result in DXF file.
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Free DWG Viewer 

Free DWG Viewer will open native DWG, DXF, and DWF files for viewing, along with accompanying Xref files. It will also open Informative Graphics' own "content sealed" (CSF) file format, which is generated by the company's Net-It publishing products
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MITCalc - Tension Springs 

Geometric and strength designs of helical tension cylindrical springs loaded with static loading. Application supports Imperial and Metric units, is based on ANSI, ISO, DIN standards and support many 2D and 3D CAD systems.
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MITCalc - Multi pulley calculation 

The calculation is developed for geometrical designs of belt and chain transmissions with more sprocket wheels. Application is developed in MS Excel, is multi-language, supports Imperial and Metric units and support many 2D CAD systems.
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MITCalc3D for Autodesk Inventor 

This multi-language calculation package includes solutions for gearing, belt, chain, springs, beam, shaft, and many others. MITCalc support 2D and 3D CAD systems, Imperial and Metric units and many international standards (ANSI, ISO, DIN?.).
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