Wikipedia
IntelliCAD
IntelliCAD is a CAD-software programming toolkit and API published by the IntelliCAD Technology Consortium ("ITC"). IntelliCAD aims (at some levels) to emulate the basic interface and functions of AutoCAD. Unlike typical CAD programs, ITC IntelliCAD is not sold directly to end users. ITC IntelliCAD is exclusively licensed to Consortium members who pay fees in exchange for permission and guidance to include IntelliCAD technology in final OEM "IntelliCAD" (and other) products with their own end user license agreements. The ITC has nearly 50 members.