OpenGL
is a portable application programming interface (API) for 3D graphics.
Popular Proprietary File format
Web
HPGL
is initially for plotters of Hewlett-Packard. Because all CAD systems support plotters it becomes a simple way to send data from CAD systems to 2D systems like word processors or imaging tools.
DXF
is initially for Autocad of Autodesk. Both the fact that it is simple and that many CAD vendors want to compete with Autodesk turn it into a de facto standard.
OLE for Design and Modeling
Based on the idea and the interface of OLE2 Object Linking and Embedding it should be possible to allow assembly of parts of multiples systems without transferring the data. This is the idea beneath OLE for Design and Modeling launched by Intergraph.
Standard Programming Interface
Web
CAM*I AIS
was a project running in the 198x to define a common interface for modeling on all CAD systems. This initiative did not succeed but many ideas survives in new standards.
SDAI
Web
OLE for design and manufacturing
is now extended to give a programmatic interface for windows based CAD systems. This is a COM interfacing.
look at Software Components Models for a discussion of the various models from the software viewpoint.
Standard Part Library
Web
Joining CAD standards and mechanical standards is the work done on
standard parts like screw or nibbles. This work is done under the number ISO13584
An important reference site on CADLIB-PLIB is on the site of
the LISI initiator of this project (in French).
DIN66304
.PLIB is also a follow up of the german
DIN66304
.
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An important reference site on CADLIB-PLIB is on the site of
the 
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