Open Source Solid Modeling CAD
Xj3D is an open-source Java codebase for the X3D Graphics standard.
Java3d scenegraph editor
A Strong and Easy-to-use Single View 3D Hand+Body Pose Estimator
A processing system for 3D triangular meshes
Maxwell Render for Blender
A simple and easy to use render farm for Blender
A Ruby script to export Google SketchUp scenes as Ogre 3D meshes
A php script for generating Rubik's cube visualisations