The CncSimulator is "Returnware" with a full sharp license for free.
It converts among the three popular CAD drawings’ formats: DXF, DWG, and DWF.
Powerful desktop survey and design program.
API for NET developers that supports AutoCAD DWG, DXF, PLT and other CAD formats
Solution to view, print, review, edit, modify, protect, convert DWG DXF DWF drawings.