It converts among the three popular CAD drawings’ formats: DXF, DWG, and DWF.
The Graphisoft ArchiCAD Connection is a an add-in for Autodesk Revit programs.
Total CAD Printer automates the process of printing CAD files in batches.
Tetra4D converts 3D CAD data into rich, interactive 3D PDF documents.
A freeware viewer for P-CAD Schematic and PCB files.