DWG TrueView 2009: Free Autodesk program to view and plot DWG, DXF and DWF files
DWG TrueView 2008: Autodesk free apllication to view and plot DWG and DXF.
The Graphisoft ArchiCAD Connection is a an add-in for Autodesk Revit programs.
It makes it possible to export and import your model from Revit to Sigma.
Use Vico Control to create significantly compressed schedules without risk.