A powerful 2D design and drafting solution that lets you create, edit, view and markup any kind of 2D drawing. It includes productivity tools, an API, and a familiar user interface that makes it easy to transition from other comparable CAD applications.
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Ribbon Interface API
The Ribbon Interface API in DraftSight Professional and Enterprise 2018 allows 3rd party add-in developers to add their custom User Interface to the ribbon to interact directly with those add-ins.