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ObjectDCL
An interactive replacement of the DCL language for developing dialog boxes within AutoCAD, sold online. (infos)AutoCAD Developers Group Europe
A non-profit association of software developers who are working on applications around AutoCAD. (infos)
AJaX - the AutoCAD/Java eXtension
An open source project to integrate a Java2 VM into AutoCAD and to provide the necessary interfaces and class libraries. (infos)
Ransen's ObjectARX Course
A multimedia based tutorial on programming ObjectARX on CD-ROM, with three of 20 chapters downloadable as a demo. (infos)
OpenDWG Alliance
An association of CAD customers and vendors committed to promoting Autodesk's AutoCAD DWG drawing file format as an open, industry-standard format for the exchange of CAD drawings. (infos)
AutoCAD Exposed
Information about undocumented features of AutoCAD, such as commands, system variables, and functions of the ADS, ARX, and AutoLISP programming interfaces. (infos)
ARX LT SDK
An extension to AutoCAD LT to enables the ObjectARX API as with the standard version of AutoCAD. (infos)
Py_acad
A free software module that makes it possible to extend AutoCAD with the Python programming language, in a similar way as with AutoLISP. (infos)