Free 3D software

Online STL viewer -- Marco Antonini Wiki

Below are the 3D programs I found before Nov 2012, and posted on the Xerocraft forum:

The TinyUrl link to this list is -- tinyurl.com/free-3D-software

(* indicates that I haven't tried it yet)

3D Tin
online software

Wings3D

MeshMixer

Blender

OpenSCAD
3D CAD design software

123D
3D scanning and other 3D software from Autodesk

like:
123D Design


Meshlab
software to view and manipulate 3D objects

SketchUp*

SVG exporter * (Google Sketchup plugin)
for exporting 3D files to be cut on a board in a 2D laser cutter

Smooth Teddy
3D drawing software by Takeo Igrashi

Rhonda 3D*
3D drawing software

Shapeshop*
3D drawing program

K-3D*
3D modeling software

Art of Illusion*
3D modeling software

Vue Pioneer*
3D landscape making software

TopMod*
topological mesh modeling

K3DSurf*
mathmatical models

Scherk-Collins Sculpture Generator*

Sculptris
free 3D sculpture program from Zbrush


ViewSTL*
for viewing 3D files

netfabb Cloud
corrects the errors in STL files
before they are printed on a 3D printer

Repetier*
software for looking at how a file will 3D print

Reconstructme*
free 3D scanning software for the Kinect

Skanect*
free 3D scanning software for the Kinect

OpenSim*
multi-user 3D application server

My3DScanner*
3D scanning from photographs

APPS

Augment
Augmented reality app

Aurasma
Augmented reality app

STLview*
app for viewing 3D files