Almost any decent CAD/3D modeling tool nowadays supports both IGES (.igs, .iges) and AutoCAD DWG formats. As such, it should be pretty easy to find a program capable of this conversion. Some programs known to support this CAD conversion are listed below.
Convert IGES 3D exchange format to AutoCAD drawing.
We found 15 software records in the database related to .igs to .dwg file format conversion.
Microsoft Windows software - convert igs to dwg on Windows
Leading 2D and 3D CAD development software from Autodesk
Convert from igs file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned igs to dwg. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Autodesk Inventor is modeling application used to create 3D digital prototypes.
A CAD and Gerber conversion software
A 3D modelling software
A dedicated 2D/3D CAD software
A feature rich 3D CAD software by Siemens
A 2D and 3D CAD construction software
A family of 2D/3D CAD software products for Windows
Apple macOS / Mac OS X software - convert igs to dwg on OS X
Mac version of popular Autodesk AutoCAD software