Viewing, mark up, measurement and printer controls for DWG, DXF, HPGL and CalComp vector files plus over fifty raster file formats. http://www.trixsystems.com/dcenter.html
An Open Source program that allows to open, view, print and convert DWG or DXF files up to version 2002 on the Linux platform. http://lx-viewer.sourceforge.net/
Programs for review, comparison and markup of a variety of CAD formats, online and standalone, as well as graphics file conversion, and plot management. http://www.allegria.com/
Software for managing CAD and Image file archives, with directory thumbnail preview, viewing and printing of popoular file formats. http://www.etecad.com/
Gives MicroStation or AutoCad uses the ability to view, edit and redline your CAD files, .DGN .DWG, with support for image fils. http://www.pcscad.com/