DeliCAD Software

Deliview 

DeliView 3.1 is a Dwg file viewer and preview extractor. It shows previews of Dwg files from version 13 to version 2005. Moreover, it can identify file version, even for file previous to version 13 and detects corrupted files.
autocad cad dxf viewer dwg

RapidDXF 

RapidDXF reads ASCII (text) files of coordinates and creates DXF (version 12) files of points and thier attributes. The DXF files so created are usable in many CAD software. RapidDXF can process several files at a time.
xyz nxyz points import cogo survey coordinates gis