| 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. |
| ARX LT SDK: An extension to AutoCAD LT to enables the ObjectARX API as with the standard version of AutoCAD. |
| AutoCAD Developers Group Europe: A non-profit association of software developers who are working on applications around AutoCAD. |
| AutoCAD Exposed: Information about undocumented features of AutoCAD, such as commands, system variables, and functions of the ADS, ARX, and AutoLISP programming interfaces. |
| Open Design 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. |
| 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. |
| Ransen's ObjectARX Course: A multimedia based tutorial on programming ObjectARX on CD-ROM, with three of 20 chapters downloadable as a demo. |
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