No specific info about version 5.1. Please visit the main page of DWG Tools - View & Convert DWG on Mac Informer.
It is a Macintosh software that functions to take the place of Video Server E.
Browse, view, measure, and print DWG/DXF/DWF files.
ZFX Tools is an application combining a number of useful functions.
DWG-DXF Converter is compatible with DWG 2010 files.
Print-Tool is a layout and print application for Mac.