CADDD (the three D's represent 3D) aims to be a 3D open source cross platform CAD system. It is currently in its infancy. Building block programs will be hosted here to aid in the journey to the final product.

Update: The bulk of all required technologies have been integrated together in http://www.caddd.org/2010/04/opencascade-12-hours-from-zero-to-hero.html'>The OpenCASCADE Challenge! Feel free to download and try it out.

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Utilized Libraries:
Python 2.6.5 (Programming Language)
OpenCASCADE 6.3 (Modelling/Visualization)
PYTHONOCC 0.4 (Python OpenCASCADE Bindings)
Qt 4.6 (GUI)
PyQt4 4.7 (Python Qt Bindings)
OpenGL (System Provided Graphics Acceleration)
PyOpenGL (Python OpenGL Bindings)

-Don't forget to get both the python-qt4 and python-qt4-opengl modules on Ubuntu