ProKon - is an amazing engineering calculator with multiple conversion and calculation modules.

ProKon and what ProKon...archaic. ProKon's capabilities...discs. Prokon's 

It uses a third-party component that suppport many advanced AutoCAD features.

using the PROKON DWG Engine 

A collection of over forty structural analysis, design and detailing programs.

Prokon Structural 

The PROKON RobotLink is a add-on for Autodesk® Robot™ Structural Analysis.

members in PROKON® Structural...the PROKON RobotLink...the relevant PROKON module