DraftView

Direct viewing of Computervision CADDS, Personal Designer, AutoCAD DWG, DXF, HPGL, CALS, CGM and other file formats.
http://www.draftware.com/

Trix DrawingCenter

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

Volo View

Autodesk's web-enabled review and markup tool for engineering data, working with the DWG, DXF, DWF, and Inventor formats.
http://www.autodesk.com/voloview

Actify, Inc.

The Spinfire 3D CAD viewer allows users to view, share, dimension, cross-section, and annotate 3D files from most common formats.
http://www.actify.com/

Preview

PostScript viewer and converter for Windows.
http://www.lib-sys.com/

Pangaea CAD Solutions

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/

Slick for Windows

View and print a large number of vector and raster file formats. Includes raster conversion, redlining, and database for file notes and tracking.
http://www.slickwin.com/

Cimmetry Systems Inc.

Develops the AutoVue family of programs to view and markup 2D/3D CAD and office formats. A thin/thick-client CAD viewer integrates with ERP, PLM, and document management systems.
http://www.cimmetry.com/

Dr. Dwg., Inc.

Suite of products for viewing AutoCAD drawings online and offline, with redlining and hyperlink capabilities.
http://www.drdwg.com/

Cyco Software

AutoManager View - view, print and compare all your CAD and office documents in a single environment.
http://www.cyco.com/amview/index.html

Informative Graphics Corporation

Viewing and markup software for a variety of document formats, drawings and images, including Java-based Web viewing, markup and collaboration.
http://www.infograph.com/

CADlook

File viewer, inspector, and translator software for IGES, STEP, VDA-FS, and NC G-code data.
http://www.cadlook.com/

CADViewer Pro

A viewer for AutoCAD Drawing Web Format (DWF) and SVF, for redlining CAD drawings on any client platform via a web and Java based interface.
http://www.cadviewer.com/

Software Companions

Viewers and converters for HPGL, Gerber, and Excellon files, with an ActiveX Control version.
http://www.softwarecompanions.com/

Allegria Software

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/

C2C Technologies, Inc.

offers the 3D CAD viewing software SolidView, supporting the most common geometry file formats.
http://www.cadcommunications.com/

CAD Viewer

Viewer that supports all DXF/DWG, HPGL, HPGL/2, JPG, and TIF files, even within ZIP archives, and allows to print them.
http://www.guthcad.com.au/viewer.htm

Etecad File Manager

Software for managing CAD and Image file archives, with directory thumbnail preview, viewing and printing of popoular file formats.
http://www.etecad.com/

IGES Toolbox

A CAD file viewer that reads, displays, and prints IGES format data files.
http://www.igestoolbox.com/

FPLOT

A HPGL/2 interpreter software, that can be used to view and print plot files, or as a plotter driver for other programs.
http://www.fplot.com/

Materialise Software: Magics Communicator

On-line conferencing over the internet, with 3D CAD visualisation, measuring, annotation, and 3D CAD file sharing in IGES, VRML, VDA and 3D DXF files formats
http://www.materialise.com/mt.asp?mp=cm_main

Spicer Corporation

Viewing and markup software for 2D/3D CAD, raster, and office file formats, with API for integration other software systems.
http://www.spicer.com/

Rasterex

Multi format viewers with markup and collaboration facilities, raster editing software, and related developer tools.
http://www.rasterex.com/

iTwinView

An online service for viewing CAD files in your web browser through a Java applet, as well as software for file viewing and conversion.
http://www.cad2dtp.com/

IC CAD

A simple program for viewing and printing CAD files from the AutoCAD and Microstation formats.
http://www.iccad.ca/

equivaQ Software

A HP-HL/2 plot filew viewer and print queue manager for Windows, that also exports data to several other formats.
http://www.equivaq.com/

NavisWorks, Ltd.

NavisWorks is a design review solution that allows to view and coordinate 3D models.
http://www.navisworks.com/

Lx-Viewer

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/

PloView

Displays HPGL/HPGL2 graphic files, with output to printers and plotters, and PDF, DXF, TIFF, JPEG, and BITMAP files. Also allows text search and measurement of distances.
http://www.isoplotec.co.jp/ehp.htm

GaViewer

A sample application of a Java applet displaying vector graphics on web pages, based on DXF/DWG files or HPGL plots uploaded by the user.
http://pszwed.ia.agh.edu.pl/gavgenserv/