We have developed graphical calculation technology that eliminates mathematical calculations and equation solving from the design process. 

Based on the technology we have developed Graficalc, SectionCalc, and ToleranceCalc products.  GrafiCalc we sell via the web.  ToleranceCalc is AutoDesk Inventor 2012 certfied tolerance anlysis plug-in.  SectionCalc is automatic CAD section property calculator.  It can read DXF file as input from all poular CAD applications.  It can then calculate 14 vital section properties with 1 click. 

We are interested in offering SectionCalc as an add-on product to ZWCAD 2D for use by mechanical, civil, HVAC, and structural engineers.