CADE Pro

CADE Pro is not just a converter. It is a compact but powerful vector editor which could be used to convert existing drawings and create new drawings from scratch.

You can think of it as a lightweight AutoCAD or Microstation in a single application.
Main features:
-CADE Pro supports the following DXF and DWG flavours:
-DXF R12/LT2, DXF R13/LT95, DXF R14/LT98/LT97, DXF 2000, DXF 2004, DXF 2007
-DWG R13/LT95, DWG R14/LT98/LT97, DWG 2000, DWG 2004, DWG 2007
-CADE Pro supports all basic AutoCAD and Microstation entities such as
-Primitive shapes
-Blocks / cells (including parameterized blocks)
-Layers / levels
-Colors
-Line type / weight
-Hatch type / scale