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You're probably thinking of AutoCAD, which isn't written in Lisp, but scriptable using Autodesk's variant of Lisp.

• lispm 12y ago
  http://www.ptc.com/product/creo-elements-direct/modeling http://www.ptc.com/product/creo-elements-direct/modeling written mostly in Lisp
  • zvrba 12y ago
    Yes, it was PTC. I couldn't remember it. Thanks.