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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

ISS Foresight
Experience 3D rapid prototyping as only ISS Foresight can deliver it. Effortlessly add 3D objects and elements, each of your changes and additions created in the 2D Designer are applied instantly in the 3D Navigator. Visit iss3d.com for Tutorials

PDSYMS DXF Symbols Library
PDSYMS v2.0 is an Architectural/Interiors DXF-FORMAT Symbols Library Add-on for all CADD packages running on all platforms and Operating Systems.

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

TigerCad
2D-CAD Primarily for mechanical, architectural and diagramming. For professionals with complex drawings, but also approachable and easy to learn for newcomers. Comprehensive manual and online help. Emphasis on drawing efficiency. Save in DXF.

RasterVect
Vectorizer. Transforms raster images into a vector format. Raster drawing can be imported by scanning original paper drawings. The target vector formats are understood by most common CAD programs that use vector graphics (AutoCAD, Corel Draw etc.).