DWGSee, a ACDSee-like free dwg viewer
Edit by : A lite and fast dwg viewer, browse, view, measure, print DWG, DXF, DWF files. Supports AutoCAD drawing format from R2.5 to the latest version 2010.
DWGSee DWG Viewer Pro version supports DWG to Image(jpg, tiff, gif ), dwg to pdf conversion, it also supports advanced markup, let you publish markup in PDF or Image format.

Features
Support view and browse mode;
Print DWG;
Batch plot dwg;
DWG to JPG, DWG to TIFf, DWG to GIF Conversion( Pro version only);
DWG to PDF Conversion(Pro version only);
Publishing markup in PDF or image format(Pro version only);
Markup, (rectangle, ellipse, Cloud markup);
Measure length and area with smart snap;
View dwg , dxf and dwf file;
DWG revisions comparison ;
Support AutoCAD dwg format from R2.5 to the latest version 2010; you can free download DWGSee Free DWG Viewer 2.31 now.