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ObjectARX for AutoCAD Map 3D

ObjectARX® for AutoCAD Map® 3D is the C++ object-oriented application programming interface for AutoCAD Map 3D. It includes C++ libraries for developing AutoCAD Map 3D applications and extending AutoCAD Map 3D functionality. In addition, ObjectARX Managed Wrapper (.NET) Classes present all of ObjectARX as Managed C++, which lets you access ObjectARX functionality using VB.NET, C#, or any other .NET language. ObjectARX for AutoCAD Map also includes a developer's guide, reference documentation, and sample code for both the ObjectARX C++ and .NET interfaces.

License and Download
ObjectARX license agreement and download for AutoCAD Map 3D.