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LITIO is a sheet metal program that calculates flat (unfolded) sheet development of ducts, rectangle to ound transitions, cylinders, cones, pipe intersections, connections, bifurcations, elbows, etc. For HVAC, hoppers, cyclones, dust extraction, ducts, conveying systems, silos, piping, etc. To draw your sheet metal developments directly in AutoCAD R2000 and later (no need of DXF convertions).

Download LITIO - 3D Sheet metal unfolder 1.0

Easy CAD Viewer
View, print, plot, annotate, convert, manage DWG, DXF, DWF drawings on your PC without using AutoCAD. The software is more than a viewer; it converts DWG, DXF, DWF drawings to image formats such as JPG, works with AutoCAD DWG DXF DWF all versions.

AutoQ3D Community
Start right away exploring 3D CAD with this Open Source Free 3D Editor released under the GNU GPL License

Domus.Cad Mac
Domus.Cad is an architectural 3D CAD program. It is a tool for the design and modeling of architecture, interior, landscape, and urban spaces.

DWF 2 DWG converter
DWF Importer(a.k.a. DWG to DWF Converter) is An AutoCAD Addin let you import dwf file into AutoCAD. It supports AutoCAD 2005, 2004, 2002, 2000(i) and R14.

ProgeCAD DWG Viewer
Free 30-day trial of DWG drawing viewer, plotting, rendering, PDF output! High precision measuring, zoom. pan, all the features you need to review your AutoCAD drawings and output them to paper. Easy to use,