DeliCAD

DeliCAD offers add-ons and COGO utilities for AutoCAD and vertical products (AutoCAD LT, AutoCAD Mechanical, Autodesk Map, and Autodesk Architectural Desktop).

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RapidDXF
Trial version
RapidDXF: Efficiently Import Topographic Data into Your CAD System
Windows
DXF Works
Trial version
Extract data from DXF files and create your own file format.
Windows