Dust3D is a cross-platform open-source 3D modeling software
Virtual paper folding program
build three dimensional structure
A simple and easy to use render farm for Blender
Gimpel3D - 2D/3D Stereo Conversion Editor
smart car simulator
A Ruby script to export Google SketchUp scenes as Ogre 3D meshes
The X3DV Module Suite is a free set of Netbeans modules to code in X3D