'StCAD' is a basic 3D CAD framework implemented in VisualWorks Smalltalk. It can be used for 3D motion simulation and other. Details on the framework can be found here.
It is now open sourced with MIT license. The author Aik-Siong Koh hopes Pharo users will port it to Pharo. Read the details.
The download is provided as a ZIP.
The download is provided as a ZIP.