Euclid (computer program)
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Euclid is a CAD software which was developed by the French company Matra Datavision, itself later acquired by Dassault Systèmes, at which point support for the software stopped. Euclid was able for 2D and 3D modeling. 3D modeling was done with boolean operations.
The Open CASCADE open-source geometry kernel emerged from the ashes of Euclid.
The BRL-CAD CAD software imports and exports to the EUCLID file format.