A free CAD file viewing application that can open, view, and print DGN, DWG and DXF file formats. One of the most widely used CAD viewing programs in the world, with a user base in the millions.
http://www.bentley.com/en-US/Promo/DWG+CAD+Viewer/Bentley+View
Quality conversions of existing engineering data to Pro/ENGINEER v.2001/Wildfire and SolidWorks formats.
http://www.3dconversion.ro
Viewing and markup software for 2D/3D CAD, with API for integration other software systems.
http://www.spicer.com/
Viewers and converters for HPGL, Gerber, and Excellon files, with an ActiveX Control version.
http://www.softwarecompanions.com/
View and print a large number of vector and raster file formats.
http://www.slickwin.com/
AutoCAD Viewers for all major AutoCAD formats, and archiving functionality.
http://www.rasterex.com/
PostScript viewer and converter for Windows.
http://www.lib-sys.com/
Viewing and markup software for a variety of document formats, markup and collaboration.
http://www.infograph.com/
A CAD file viewer that reads, displays, and prints IGES format data files.
http://www.igestoolbox.com/
A simple program for viewing and printing CAD files from the AutoCAD and Microstation formats.
http://www.iccad.ca/