3D Box Creator - http://www.rizonetech.com/
3D Box Shot Maker - http://www.bosseye.com/boxshot/index.htm
3D Models (free) - http://www.uniquevault.com/
3D Plus = Serif 
3D Real Viewer - http://www.cze.cz/products.php?lang=en
3D Rotate - http://www.yofla.com/flash/3d-rotate/
3DsurG (hpnf) - http://www.freewarefiles.com/3DSurG_program_46525.html
3DVia Shape (online) - http://www.3dvia.com/shapeit
3DVIA Shape 2 - http://www.3dvia.com/products/3dvia-shape/

Albatros3D (was PP Modeler) - http://www.ppmodeler.com/index.php
Alice (3d authoring) - http://www.alice.org/
Aqsis (render) - http://sourceforge.net/projects/aqsis/files/ (http://www.aqsis.org)
Art Of Illusion - http://www.artofillusion.org/
Auto3d (2d->3d anaglyph) - http://www.softpedia.com/get/Multimedia/Graphic/Graphic-Editors/Auto3D.shtml
Awakening - http://www.awingsoft.com/index.htm
Ayam - http://ayam.sourceforge.net/

Behemot - http://sourceforge.net/projects/behemot/
Bigle 3d (sterogram maker) - http://www.beroux.com/english/softwares/bigle3d/
Blender (3d suite) - http://www.blender.org
 - Suicidator City Generator - http://arnaud.ile.nc/sce/
BRL-Cad - http://sourceforge.net/projects/brlcad
Bryce 7 Pro (now free) - http://www.daz3d.com/i/3d/free-3d-software-overview

Canvas Commander - http://www.softbattery.net/canvascommander/index.htm
Cloe Raytracing - http://cloe.xnview.com/
Contour - http://www.willus.com/archive/#photo
CrackArt (texturing) - http://www.crackart.org/
Cyberdelia (3d models/animations) - http://vixar.jp/cyberdelia/english.html

DAZ Studio Pro (now free) - http://www.daz3d.com/i/3d/free-3d-software-overview
DeleD - http://www.delgine.com/index.php?filename=product_deled
Design Expert Free (crippled) - http://www.deskartes.com/
DevConv (Dxf/Dxb/Dwg covertor) - http://freeware.intrastar.net/cadsoftware.htm
DX Studio Editor - http://www.dxstudio.com/

Envisioneer Express - http://www.envisioneerexpress.com/
Explogen (simulate explosions) - http://www.kenginegaming.com/
Estierra (terrain modeling) - http://www.fountainware.com/Products/estierra/index.htm

FaceGen Modeller Free - http://www.facegen.com
Freestyle - http://freestyle.sourceforge.net/
Fun3d - http://code.google.com/p/fun3d/

Gauss - http://www.waltermilner.com/gauss/gauss.htm
GBData (plot 3D surfaces) - http://www.garybeene.com/free/index.htm
Gelato - http://download.chip.eu/en/Nvidia-Gelato-2.0_155795.html
Geoblock (2d,3d modelling) - http://geoblock.sourceforge.net/
Glaux/GL (hard to find) - http://jameslow.com/old/software/downloads.html
GLS Viewer (for 3D Mesh) - http://glscene.sourceforge.net/wikka/HomePage
Gmax - http://www.turbosquid.com/
GameTools - 
Google Sketchup - http://sketchup.google.com/
GroImp (model 3d,java req) - http://www.grogra.de/

Hexagon (now free) - http://www.daz3d.com/i/3d/free-3d-software-overview
Houdini (Free Edition) - http://www.sidefx.com

Inkscape - http://sourceforge.net/projects/inkscape/
Insight3d (3D model from photo) - http://insight3d.sourceforge.net/
InSightPoint - http://www.icytec.com/
Ioso - http://www.iosotech.com/product.htm

J3DWorkbench - http://eclectic3d.net/taxonomy/term/2

K-3D Surf (3d,4d,5d) - www.k-3d.org
Kerkythea (3d model/effects) - http://www.kerkythea.net/joomla/

Land Explorer (3D Mapping App) - 
Light Map Maker (lighting effects)- http://www.awingsoft.com/index.htm
Lightworks (reg req) - http://www.lightworkdesign.com/
LuxRender - http://www.luxrender.net/en_GB/index

MachStudio Pro 2 - http://www.studiogpu.com/
Make Human - http://www.makehuman.org/
MiniMagics - http://www.materialise.com/materialise/view/en/2562719
Maya PLE - http://usa.autodesk.com/adsk/servlet/index?siteID=123112&id=7639525
MeshLab - http://www.meshlab.org/
Mesh Viewer - http://mview.sourceforge.net/
Misfit Model 3D - http://www.misfitcode.com/misfitmodel3d/
Mitsuba (renderer) - http://www.mitsuba-renderer.org/

Nimbus Basic (modelling,animation,rendering) - http://www.simulart.com/
Now3D - http://digilander.libero.it/giulios/Eng/homepage.htm
Nvidia Gelato - http://www.softpedia.com/get/Multimedia/Graphic/Graphic-Editors/NVIDIA-Gelato.shtml

OpenFX - http://www.openfx.org

P3dO Explorer (3D viewer) - http://www.senosoft.com/softp3do.php
Panorama - http://panorama.sourceforge.net/
Photofly Photo Scene Editor - http://labs.autodesk.com/utilities/photo_scene_editor/
Photosynth - http://photosynth.net/about.aspx
Pixie (renderer) - http://www.renderpixie.com/
Plingme (add buttons to 3d object) - www.plingme.com
Pointshop 3D - http://graphics.ethz.ch/pointshop3d/downloadPS3D20.html
PolyAr (CLi polygon area) - http://www.wrotniak.net/works/polyar/index.html
PolyGo (create nested polygons) - http://download.cnet.com/PolyGo/3000-2191_4-10429390.html
Povlab - http://pdelagrange.free.fr/povlab/
POV-Ray - http://www.povray.org/
Pover (pov-ray shell) - http://erny.narod.ru/eng/pover.htm
PPModeler - now Albatross 3D
PSTOedit - http://www.pstoedit.com/pstoedit/

RenderMonkey - http://developer.amd.com/archive/gpu/rendermonkey/pages/default.aspx

Sculp (animate) - http://www.sas21.de/apps/sculp/
Sculptris (3D sculpture) - http://pixologic.com/sculptris/
Serif Drawplus - http://www.freeserifsoftware.com/
Serif 3D Plus2 - http://www.freeserifsoftware.com/software/3dplus/
SmoothTeddy - http://www-ui.is.s.u-tokyo.ac.jp/~takeo/java/smoothteddy/index.html
SodiPodi - http://sourceforge.net/projects/sodipodi/
Structure Synth - http://structuresynth.sourceforge.net/
SunFlow (renderer) - http://sunflow.sourceforge.net/
SweetMollyGrace (suite - render/animate molecules) - http://rodomontano.altervista.org/engSweetMG.php

Teddy Java Applet - http://www-ui.is.s.u-tokyo.ac.jp/~takeo/research/teddy/teddy.htm
Terragen - http://www.planetside.co.uk/terragen/
Three D (cyan/red 3d anaglyphic glasses req)
 - http://www.vclcomponents.com/Java/Applets/Image_Effects/Image_Display/tov__Three_D_Object_Viewer_-info.html
Toxic - http://www.toxicengine.org/
Truespace - http://www.caligari.com/

Unicorn3D (editor) - http://www.rw-designer.com/3d-editor

View Expert - http://www.deskartes.com/
VisIt - https://wci.llnl.gov/codes/visit/about.html
Visman 3d - http://freeware.intrastar.net/othergraphics.htm
Visual Terrain Maker - http://www.ungsoft.com/vtm/
VISup Optimiser (LFV) - http://www.321download.com/LastFreeware/page11.html

Wings 3D - http://www.wings3d.com/

X Model Viewer - http://www.falcoware.com/XModelViewer.php
XSI Mod tool - http://www.softimage.com/products/
 
YafaRay - http://www.yafaray.org/