4Design - http://www.4dgraphics.net/4design.htm

Able Vector (vectorise raster images in AutoCad) - 
ACadPvi Shell Extension - http://www.jmsware.com
Alibre Design Xpress - http://www.alibre.com/xpress/software/alibre-design-xpress.asp
AnkerCAD (Blocks) - http://blockcad.net/ankercad.htm
AnyCad - http://anycad.codeplex.com/
Archimedes - http://archimedescad.github.io/Archimedes/
Autocad Drawing Viewer - http://www.skysof.com/
AutoCad Version Explorer - http://www.jmsware.com/info-ave.html
AutoQ3d Community - http://autoq3d.ecuadra.com/index.php/alldownloads/all-product-downloads
Avacado - http://avocado-cad.sourceforge.net/

BikeCad - http://www.bikeforest.com/CAD/index.php
BlockCad (like Lego) - http://web.telia.com/~u16122508/proglego.htm (http://blockcad.net/proglego.htm)
BlueCad - http://www.cadwaresoft.com/eng/html/bc10install.html
Browz 3d (viewer) - http://users.skynet.be/bk232951/

Caddit - http://freeware.intrastar.net/cadsoftware.htm
CadFaster Quickstep (viewer) - http://www.cadfaster.com/products/quickstep.php
Cad OCX (ActiveX control for Autocad) - http://www.skysof.com/
CadX11 free - http://www.graytechsoftware.com/products/cadx11/cadx11free.asp
CMS Xpandy (adware) - http://intellicadms.com/site/Products.html
CoCreate Modeling PE - www.cocreate.com
Cycas - http://www.cycas.de/

DeleD 3D - http://www.delgine.com/
Design Workshop lite - http://www.artifice.com/dw.html
Document 3d Suite 2008 (+dtp) - http://download.cnet.com/Document3D-Suite/3000-6677_4-10811502.html
Draw3D - http://www.draw3d.com/
Drawings Now (share online) - http://labs.solidworks.com/Products/Product.aspx?name=drawingsnow
DwgGateway (AutoCad convertor) - http://www.dwggateway.com/

EDrawings Viewer - http://www.edrawingsviewer.com/
Emachineshop - http://www.emachineshop.com/download/index.htm
Envisioneer Express - http://www.envisioneerexpress.com/

Felix lite - http://www.graebert.com/FelixCADlt_promo.html
Frame3DD - http://frame3dd.sourceforge.net/
Freecad(1) - http://www.ar-cad.com/
Freecad(2) - http://sourceforge.net/projects/free-cad
 - http://sourceforge.net/apps/mediawiki/free-cad/index.php?title=Main_Page
FreeDraft - http://freeengineer.org/FREEdraft.html

GB VRML - http://www.garybeene.com/free/index.htm
Gmsh (Generate infinite 3D grids for use with CAD) - http://www.geuz.org/gmsh/
Google Search Plugin - http://www.planetude.fr/html/outils.asp
Google SketchUp - http://sketchup.google.com/product/gsu.html

InstaCad - http://freeware.intrastar.net/cadsoftware.htm
IntelliCad - (info only) http://web.archive.org/web/20040211233551/cad.msvl.k12.wa.us/IntelliCAD.htm

JustCad - http://www.justcad.com/

LeoCad(Lego) - http://www.leocad.org/
Lego Digital Designer - http://ldd.lego.com/
Live Dxf2Bmp Convertor - http://engknowledge.com/live_dxf2bmp.aspx

Medusa4 Personal - http://www.cad-schroer.com/products/medusa4-personal.html
Medusa Personal (import only/watermark) - http://www.cad-schroer.com/Products/MEDUSA/M4Personal/
 - CSG Thumbnails - http://www.cad-schroer.com/Support/Downloads/
Mino 3D - http://earthsci.org/freeware/freewar.html
Minos - http://www.le-boite.com/minos.htm

NaroCAD - http://narocad.com/

OcTree - http://www.octree.de/
OpenSCAD (2D to 3D render) - http://www.openscad.org/

PowerShape-e - http://www.powershape-e.com/
PythonCad - http://www.pythoncad.org/download.html

Quadrispace Free Reader 3d - http://www.quadrispace.com/products/reader3d/index.htm
QuickCad - http://www.millican.info/oldsite/pcsoft.htm

SagCad(linux) - http://sourceforge.net/projects/sagcad/
Simple Vector Shapes - http://acontoli.googlepages.com/csharp
SoftCad 3D lite
 - http://www.freecadapps.com/swdetails.php?orgvalue=&page=category&review=3825&rowcolor=ffffcc&value=OCD-OCD
Solidview lite (see 3d models from cad apps) - http://www.solidview.com/Products/SolidViewLite
SolidWorks Explorer (cad file manager) - http://www.solidworks.com/sw/support/downloads.htm
StCAD (framework for Smalltalk) - http://www.askoh.com/stcad/index.html

TinyCad (electrical) - http://sourceforge.net/projects/tinycad/
TurboCad - http://web.archive.org/web/20040211233551/cad.msvl.k12.wa.us/IntelliCAD.htm
TurboCad LE (Learning Edition) - http://www.turbocadables.com/download.php

Ultra AutoCAD Tool ( - http://www.skysof.com/

Vector Engineer Quicktools - http://www.vectorengineer.com/

Vizup - http://www.snap2objects.com/
Wingeom (2D/3D drawing) - http://math.exeter.edu/rparris/wingeom.html

Xtracta (extract data) - http://www.skysof.com/

Free CAD apps (5486) - http://www.freecadapps.com/
2007/07/20/45-best-freeware-design-programs/
 - http://freeware.intrastar.net/cadsoftware.htm