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3D Viewing Software
DWG Viewer - Free
From: http://www.bravaviewer.com/free-dwg-viewer
Use the Free DWG Viewer to view AutoCAD files quickly and accurately. The free viewer reads DWG, DXF and DWF files without converting them to raster images. Because it supports full vector geometry, it offers these great features:
From: http://www.edrawingsviewer.com/ed/edrawings-viewer.htm
Download free eDrawings Viewer software to view, print, and review all types of eDrawings files. In addition, eDrawings Viewer allows convenient viewing of supported AutoCAD® DWG and DXF files and native SolidWorks® parts, assemblies, and drawings. The eDrawings Viewer is intended primarily for people who do not use CAD software and thus do not need to publish eDrawings files themselves.
From: http://www.varicad.com/en/home/products/products/
VariCAD Viewer is a free viewer, convertor and printing software working with 2D DWG, DXF, 3D STEP and 2D/3D VariCAD file formats. VariCAD viewer allows you to convert DWG to DXF and vice-versa, convert STEP to 3D IGES or STL formats, print 2D DWG, DXF or VariCAD formats and use batch print or batch conversions. All conversions are also available between VariCAD native format and other listed formats. VariCAD viewer offers settings of 3D display methods (like light source or perspective). 3D display can be also exported into high-resolution bitmap file.
From: http://www.bentley.com/en-US/Products/Bentley+View/
The infrastructure industry's BIM viewer of choice for interacting with IFC’s, DGNs, DWGs, and i-models, as well as point clouds and many other industry formats. With millions of users, Bentley View is arguably the industry's most powerful free BIM viewer. Meeting the industry’s demanding needs for viewing BIM, Bentley View supports over 50 other file formats, including CAD and raster image formats.
From: https://www.autocad360.com/free-cad-software/
For Windows 8
AutoCAD 360 is the official free CAD software from industry-recognized Autodesk®. Get started using AutoCAD 360 on your desktop or laptop via your web browser, or download the iOS or Android app to access it on your smartphone or tablet.
From: http://www.autodesk.com/products/dwg/viewers#
DWG TrueView Free download
This desktop software enables you to view .dwg files and includes DWG TrueConvert™ software, which lets you convert newer .dwg files to work with older versions of AutoCAD
From: https://360.autodesk.com/viewer
Online Viewer using internet browser
View 2D and 3D designs in over 50 file formats including DWG™, DWF™, RVT and IPT, as well as formats from SolidWorks, ProE, Catia and others. View large and complex files right in your browser—no downloads or plug-ins needed.
From: http://www.doublecad.com/DoubleCAD/DoubleCAD-XT-v5
DoubleCAD™ XT is an AutoCAD LT® work-alike. But free. It's also 5-Star Rated from the editors at CNET... and the #1 most downloaded free CAD at Download.com. Powerful 2D CAD capabilities — and great .DWG and .SKP compatibility — make DoubleCAD XT an invaluable free companion for AutoCAD® and SketchUp™ users alike.
From: http://pcon-planner.com/en/products/3d-room-planner/
#D Room Planner
pCon.planner is the ideal free 3D space planning tool for interior designers, retailers, manufacturers, craftsmen and planning offices. Users from various sectors, e.g. furniture, laboratory equipment, medicine and logistics, have been relying on the performance capability and ease of use of pCon.planner for many years.
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ug nx viewer free
From: http://www.ida-step.net/components/viewers/basic
Viewer: Basic is a FREE component of IDA-STEP v4 providing core viewing functionality for all kinds of STEP files (*.stp). This component alone makes IDA-STEP v4 a fully usable tool for viewing PDM, CAD and other data, available as STEP (internation standard ISO 10303) files. STEP file format is supported by the major PDM, mechanical CAD and other systems.
From: http://viewer.kisters.de/en/downloads.html
3D-Viewer, 3D-CAD-Viewer and 2D-Viewer provided by KISTERS for efficient visualization Demo Download - NOT Free
From: https://shop.oracle.com/pls/ostore/product?p1=AutoVue&p2=&p3=&p4=
Oracle AutoVue - AutoVue Enterprise Visualization is a suite of Oracle solutions designed to view, digitally annotate and collaborate on a variety of engineering, CAD and business documents without requiring investment in specialized CAD or authoring tools. Customers can choose from amongst five AutoVue solutions, each designed to suit an organization’s current and evolving document visualization requirements.
From: http://kubotek3d.com/Products/Spectrum-Viewer.aspx
Kubotek Spectrum is low cost, professional-grade CAD viewer software for reviewing 3D models and drawings. AutoCAD™, SolidWorks™, and Pro/E™, UG NX, CATIA 4, CATIA 5 (Optional), IGES, STEP and many others.