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Re:Ask HN: Which abandoned proprietary software would you re... by dcooper8 on Saturday December 08, 2018 @03:57PM (#18637493)
The ICAD System. Common Lisp based knowledge based engineering platform, including solid modeling kernel. Started on Symbolics machines and ended up on Allegro Common Lisp. Purchased by Dassault Systemes (800 lb gorilla of the CAD world) and shut down.

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