DWG to Georeferenced Tiff

I'm looking for an open software to convert vector DWG files to raster
TIFF (or Jpeg) files, producing the world file (.TFW) needed to use such
files in a Gis.
I've to convert several hundred of DWG files, so I need a program I could
use in a batch file, or I could program (as Grass, and so on).
I even need to light on or off some layers of the DWG files before
converting them, possibly setting these controls in the program or in the
batch file.
Any help?

Thanks in advance,
Maurizio Trevisani